The head of a string of pigs appeared, snout-up, over the ditch, he had to screech to a stop and watch the rear of the last pig disappear on the other side.
群猪的领头出现了，它仰着鼻子走过水渠，不得不尖叫着停下来，目送最后一只猪消失在另一端。
His son dropped down his head and said, "Beside the plank and the Banks of the ditch, I can also see its bottom."
儿子低下头说：“是这样……除了木板和沟的两边，我现在还看见了沟底。”
The head of a string of pigs appeared, snout-up, over the ditch, and he had to screech to a stop and watch the rear of the last pig disappear shaking into the ditch on the other side.
这时候出现了一群猪，仰着鼻子走过水渠，他只好用一个急刹车，目送着最后一只猪大摇大摆地跨过水沟，消失在另一端。
In the meantime the time variation of the water level in the ditch has been taken into account, therefore the groundwater head are time-varying as the groundwater flows toward the drain system.
在讨论这个问题时，又考虑进了排水沟中的水位也是随时间而变化的，因此在地下水流动过程中的任一瞬时，其地下水头差也是一个变量。
I turned my head and saw a small crucian carp in the dried-up carriage ditch.
我回过头来，看见干涸的车沟里有条小螂鱼。
I turned my head and saw a small crucian carp in the dried-up carriage ditch.
我回过头来，看见干涸的车沟里有条小螂鱼。
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