（本报记者赵成、吴丹、朱隽、王昊男、侯琳良、杨文明、王云娜、刘军国、李心萍、寇江泽、李林蔚、常钦、刘新吾、郑洋洋、李俊杰）
US oil firms are also said to be concerned about the ongoing security situation in Venezuela
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Balanced against that, finding cancers early and treating them can save lives. But it's difficult for doctors to work out which cancers are going to be aggressive and spread, which means men can be treated unnecessarily.
（四）收购国家禁止收购的其他物品的。