pm——post meridiem，中午之后。pm730指的是1930，晚上。730英语有两种说法half past seven和seven thirty.
例句
We get to school at half past seven day.
我们每天七点半到校。
It\'s half past seven. it\'s time you went to work.
7点半了。你该去上班了。
少先队网
水利万物而不争,
而万物莫能与之争。
