《战舰世界》与坦克世界一样分几个系别，我们最新整理了网友们从外网翻来的战舰世界美系科技树，一起看看有哪些强力的战舰吧！
战舰世界美系科技树
The Tree Itself : U.S. Cruisers Starting From Tier II
美系巡洋舰线从2级开始
Tier II – Chester
2级——切斯特级
“Chester” is a scout cruiser, built in the USA at the beginning of the 20th century. The main objective of this type of ships was scouting, which influenced its design – lightly armoured, but relatively high speed.
切斯特级是美国在20世纪初期建造的一种侦查巡洋舰，主要用于执行侦察任务————所以这条船没什么装甲，但是速度很快（当然，随着航空器的发展，就是靠水上飞机和侦察机去侦查了）
Tier III – St.Louis
3级，圣**斯级
“St. Louis” considerably surpasses “Chester” in terms of firepower, carrying on board 14 six inch guns. Large displacement and good armour allow it to survive longer under enemy fire, but it has low speed.
圣**斯级搭载了14门6英寸（约为152MM）炮，较之于切斯特级而言，火力得到了很大的强化。同时，大吨位和良好的防护使其在炮火的存活率得到了保证————当然，速度也是感人至深的。
Tier IV – Phoenix
4级，奥马哈原型（PS，Phoenix为毛子架空设定的名字）
“Phoenix” is the first “paper ship” of the U.S. cruisers branch, based on scout project in 1917. Lack of durability and tenacity is compensated by the cruising speed of 35 knots, excellent for its time, which allows you to keep up, even with the destroyers, and rapidly change location. Although the project was never implemented, it became the basis for the next ship – cruiser “Omaha.”
这是美帝巡洋舰线第一条图纸船，1917年的侦查巡洋舰计划。很脆弱，但是在35节下的稳定性是当时最好的，这可以让你轻松追上很多驱逐舰，以及迅速专场。虽然这条船并没有生产出来。但是，我们能在5级的奥马哈级上面看见这个图纸船的影子。
Tier V – Omaha
5级，奥马哈级
Compared with its predecessor, “Omaha” has a larger displacement, which makes her a little more robust and strong in-game. The ship will be a pioneer in several aspects: for the first time a player will see gun turrets and the catapult used to launch scout-planes on deck. Like its predecessor, “Omaha” carried torpedoes, which would be a serious problem to contend with in close combat.
和4级船相比，奥马哈级的排水量更大，这使其有更强的作战能力。这是你第一次看见炮塔（之前的几条船是没有炮塔的）和水机甲板。和低级别的几条船一样，奥马哈级能携带鱼雷，这使其在近距离作战中十分危险。
Tier VI – Cleveland
6级，克利夫兰级
“Cleveland” is the most prolific type of cruisers in naval history. All guns are concentrated in four towers which allow concentrated fire on one side of the target ship. An important feature of this cruiser is its air defense guns, powerful for its tier, which turn “Cleveland” into a destroyer of enemy aircraft.
克利夫兰级是一种被广泛生产的巡洋舰。4个炮塔收纳了所有的炮————这使其能集中所有火力攻击一侧敌人。值得一提的是，克利夫兰级的防空炮十分给力————这使其能承担队伍的防空任务。
Tier VII – Pensacola
7级，彭萨科拉级
This is the first heavy U.S. cruiser with all the attendant advantages and disadvantages. It was built during the Washington Agreement, and in order to fit into the set displacement, designers had to neglect armouring in favour of armament and speed. In the game, as in reality, it has a rather high displacement for its speed – 32 knots and increased caliber guns when compared to the “Cleveland.”
这是美国第一条重巡（之前的几条船全是轻巡），优点与缺点并存。彭萨科拉级是在海军假日期间建造的。为了使该级舰不超重，设计师不得不削弱装甲，同时强化速度与武备。在游戏中也是如此，在同排水量的重巡中，彭萨科拉的速度是相当快的，32节。和克利夫兰相比，彭萨科拉的火力又强化了。
Tier VIII- New Orleans
8级，新奥尔良级
Despite all the limitations of the Washington Agreement, project cruiser “New Orleans” managed to combine a powerful artillery armament and good body protection. Unfortunately, the same cannot be said about the air defense – because of the overflow, ship designers were not able to place sufficient anti-aircraft guns. As a result, the power of its air defense has not changed much compared to the “Pensacola”.
尽管**海军条约做出了种种限制，但是新奥尔良级还是尝试着把大威力武备和良好防护结合在一起。不幸的是，防空能力似乎并不包括在内。为了防止倾覆，设计师没有安装太多防空炮，因此，较之于彭萨科拉而言，新奥尔良级的防空火力没有太大提高
Tier IX– Baltimore
9级，巴尔的摩级
The conditions of the Washington Agreement were no longer in force with the beginning of the Second World War. Cruisers were no longer limited in displacement, which allowed an increase to their armour and air defense in the project “Baltimore.” It was a logical development of the cruiser “New Orleans” based on the principle “bigger, faster, and stronger.”
临近二战的时候，**海军条约已经失去效力了。巡洋舰没有吨位限制，这使得巴尔的摩级有更好的防护和防空能力。从新奥尔良级到巴尔的摩级就体现了“更大，更快，更强”的原则
Tier X – Des Moines
10级，得梅因级
One of the most significant problems of cruiser “Baltimore”, and of all the heavy cruisers in general, was a relatively low rate of fire. American naval designers began creating new naval guns, which soon turned into the draft heavy cruiser, “Des Moines”. The rate of fire of eight-inch guns almost doubly excels all the guns of its predecessors and its strong air defense makes it a deadly threat to enemy air groups.
巴尔的摩级还有其他重巡最大的问题在于射速感天动地。于是，美军设计师开始设计一种新舰炮，而后迅速变成了得梅因级。新式203MM舰炮的射速几乎是原来那些船上老舰炮的2倍，不仅如此，得梅因级再次强化了防空火力。这使其成为舰载机杀手。
