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Leave a gap at the top and bottom so air can circulate.
在顶部和底部各留一点空隙，这样空气就可以流通了。
《柯林斯英汉双解大词典》
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A body circulate steady and don't take up the or so space.
门体运行平稳且不占用左右空间。
youdao
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A body circulate steady and don't take up the or so space.
门体运行平稳且不占用左右空间。
youdao