脚底停球的英文：
to trap

trap是什么意思：
n. 陷阱；圈套；夹子
v. 诱捕；设陷阱；困住；使陷入困境

ball float trap
浮球式阻汽器

The pain was caused by a trapped nerve.
这疼痛是由于神经受抑制引起的。

The rat was caught in a trap.
那只老鼠被捕鼠器捉住了。

Be ware of falling into their trap.
当心中了他们的计。

She was arrayed with splendid trappings.
她穿着华丽的礼服。