词汇：clearance

n. 清除；空隙

相关场景

CHOPPER PILOT:

Sir, we need clearance. There may be people in there.

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CLERK:

Well I guess that'd be our ten-foot backyard Per-Gola. You can stand up in it. Well, some people could stand up in it. Six foot clearance at the ridge. You might just could.

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