empty a hose line 排空水带线
A message consists of a header, an empty line, and a body.
消息包括一个标题、一个空行和一个主体。
Parallel to that train line, there is a also a new highway that looked three-quarters empty.
与火车线路平行的一条新建高速公路四分之三也是空的;
For example, Line 2 shows a check that determines if an empty string has been provided.
例如,第2行检查提供的是否是空字符串。
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