duck指把头伸进水中，或指游泳时开玩笑地把一个人的头按入水中。

plunge暗示迅速而有力的动作，但浸入不一定很深。

submerge指长时间的完全浸入、潜入，强调浸入液体深层。

1.His departure rids President Ahmadinejad of a critic at close quarters, but the move may yet cause problems in a parliament that's increasingly unhappy with its presidency.

at close quarters非常近

例句：The enemy was beaten back after some heavy fighting at close quarters.

在短兵相接的激烈战斗后, 敌人被击退了。

2.Shots were fired when armed supporters of Mr Ouattara tried to chase away soldiers blocking roads to the hotel.

chase away赶走, 驱逐

例句：The dog ran out into the garden and chased the birds away.

狗奔进了花园, 赶跑了那群鸟。

3.Without the money it generates when it comes into effect in 2014, other parts of the bill could fall apart.

fall apart散开, 崩溃, 破碎

例句：The book was old and soon fell apart.

这书已有年月, 没隔多久书页都脱落了。

This cup just fell apart in my hands.

不知怎的, 我手里的这只杯子破碎了。

4.The newly-empowered Republicans have vowed to repeal the bill, and it's likely the whole issue could end up in the Supreme Court.