多环芳烃，已知会增加乳腺癌的风险。
多环芳烃同样对胎儿的DNA产生直接影响。
这是第二次，但间接的方式多环芳烃可以导致癌症。
This is a second, but indirect, way in which PAHs can cause cancer.
该法对几种代表性多环芳烃的回收率为75.0-100％。
环法国和意大利的巡回赛每年举行，其行程长达2,000多英里。
The tour RACES of France and Italy, (held each year), cover more than 2,000 miles.
多氮杂大环与许多金属离子能形成稳定的络合物。
Polyazamacrocycles are known to form stable metal chelate complexes.
多氮杂大环能与许多金属离子形成稳定配合物。
Polyazamacrocycles are known to form stable metal chelate-complexes.
治疗药物是多西环素联合阿齐霉素优于单一阿奇霉素。
Combination therapy with doxycycline and azithromycin was better than single treatment of azithromycin.
治疗药物是多西环素联合阿齐霉素优于单一阿奇霉素。
Combination therapy with doxycycline and azithromycin was better than single treatment of azithromycin.
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