英英單字圖文記憶(252)
all clear [ɔl klɪr]：
Something that is
clear is easy to understand, see, or hear.【易懂的；明白的；清楚的】
The all clear is
a signal that a dangerous situation, for example an air raid, has ended.【警報解除的信號；獲得許可】
【分解】：
【字根】clear = clear = bright，表：清楚；明白。
【分析】：clear = 清楚；明白。引申為：清楚的；明白的。
For example，
The ship was
given the all-clear to sail. 這艘船獲得了航行許可。
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