O-o
[医][=outer-to-outer]总长度，全长（宽）
🗣️ 情景例句
He'll do anything to avoid getting down to math lessons,
他老是设法想逃避数学，
Will you stay there for long?
你会在那儿待很长时间吗？
OK. While you're doing that I'll go and get some water.
好的。你系小树，我去弄点水来。