听起来基本上都顺 =）
很好,
记得每段开头要空一点
and 前面我不用逗号
用 Further more 代替also会更好.
Germany’s U-boats were also mentionable because it travelled faster than most ships and crew could use periscopes to view situations above water. They used torpedoes to sink enemy as well
Germany's U-boats are also worth discussing because they not only travel faster than most of the standard ships and the available of periscopes also allows them to view the situation above water. Further more, they also used torpedoes to sink enemy('s) (battleships).