Yet molecules are always moving, some perhaps as fast as a mile per second.
分子仍然总在行为，其中有些分子的行为速度磁缦憧秒一英里。
Mongolia is the second least populated country with just 4.2 people per square mile.
蒙古是只有4.2秒，每平方英里人口最少的国家的人民。
The rates (per ton-mile) for grain are second-lowest of any commodity, trailing only coal, White said.
除煤炭外，谷物（按吨英里算）是所有商品中运费最低的一种商品，怀特说。
The rates (per ton-mile) for grain are second-lowest of any commodity, trailing only coal, White said.
除煤炭外，谷物（按吨英里算）是所有商品中运费最低的一种商品，怀特说。
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