The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head.

砂柱下部饱和并处于静水平衡状态，在底部为定水头的条件下进行排水。

youdao

I didn't know what I was feeling; it was just a constant replaying of the event in my head.

我并不知道我当时是什么感觉，整件事只是不断地在我脑海重演。

youdao

"In a constant rhythm, as the car lurches forward and then stops short, snapping my head back and forth like a rap singer."

在固定的节奏下，车子一会儿突然向前，一会儿急刹车，我的脑袋就像个饶舌歌手一样前摇后晃。

youdao

Despite our constant worry that her head would break off, she would go room to room, checking on other patients and brighten their day.

FORBES: Should We Ration End Of Life Care?

The four-day appeal hearing was told that she is in the final stages of MS, can only move her head, cannot swallow and lives in constant pain.

BBC: Marie Fleming and Tom Curran

But many undocumented workers avoid joining unions "because they are under constant threat of deportation, " said Ana Avendano, head of the AFL-CIO's immigration and community-action program.

WSJ: Unions Seize on Immigration Debate