我认为：
上午7点半：half past seven a.m.
13亿人口：a population of 1.3 billion
7am
1thousand 3 hundred million people 或者One point three(1.3) billion
"7am" or "7 in the morning"
1thousand 3 hundred million people
At in the morning是上午七点半
Population 1.3 billion是13亿人口
halfpastseven
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