If not, it sets the POST data to an empty string.
如果没有，POST数据设为空字符串。
If the list were originally empty, you call pthread_cond_broadcast to post push data into the list.
如果列表原来是空的，就调用pthread_cond_broadcast以宣告列表中已经添加了数据。
But he says last Saturday the post office was empty.
但是，他说上周六邮局空荡荡的。
It seems a secretary post is empty.
好像有个秘书职位是空着的。
It seems a secretary post is empty.
好像有个秘书职位是空着的。
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