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。
