1.slice through 穿梭；穿过
Ripples on the leading edge of humpback fins help the whales slice through water with grace and dexterity.
座头鲸鳍部前缘的波纹结构能帮助它优雅灵活的穿梭于海水之中。

2.on top of this 除此以外
On top of this, coconut water has the same level of electrolytic balance human blood.
此外，在帮助人体血液达到电解与平衡上，椰子汁也有同样的功效。

3.have trouble doing sth 在...上又困难
Many young people have trouble communicating with their parents.
许多年轻人与父母沟通有困难。