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1·According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.

根据一种假设，这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。

2·Instead of making a clean break, water evaporating from treetops tugs on the remaining water molecules, with that tug extending from molecule to molecule all the way down to the roots.

从树梢蒸发的水并没有彻底地分解，而是拉住了剩下的水分子，这种拉拽作用从一个分子延伸到另一个分子，一直拉到根部。

3·Both tugs are fitted with a Kort Nozzle to improve their efficiency.

拖船都配备了一个导筒来提高他们的效率。

4·Make fast two tugs on each bow.

把每舷船首两艘拖船绑牢。

5·How many tugs assist pilotage?

几艘拖船协助引航？

6·Still, it tugs at our minds.

依然，这与我们的思想有关。

7·No, you need not take tugs.

不，你船不需要叫拖船。

8·The tugs are fussing about.

拖船在忙乱地来回行驶。

9·Stand by to make fast tugs.

准备把拖轮挽牢。

10·Make fast two tugs on starboard quarter.

把右舷后面两艘拖船绑牢。

(1)tug of war拔河，拔河比赛；两派间的激烈竞争

(1)tug boat拖船；拖轮