Repeat customers were a major source of business for retail travel agents with two-thirds of total enquiries coming from existing clients.

——回头客是旅游零售代理商主要的客源，有三分之二的咨询是来自于现有客户。

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The major polluting agents are animal wastes, antibiotics and hormones, chemicals from tanneries, fertilizers and the pesticides used to spray feed crops.

主要的污染物是动物粪便、抗生素和激素、制革厂的化学品、用于饲料作物的化肥和杀虫剂。

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Unlike the drugs used in HAART which target the virus, minocycline homes in on, and adjusts t cells, major immune system agents and targets of HIV infection.

HAART以病毒本身为靶子，与这种疗法使用的药物有所不同的是，二甲胺四环素采取的是导向目标追踪方式，调节免疫系统的主要行动者以及HIV感染目标T细胞。

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But many of the free agents they signed either missed time with major injuries or did not perform as expected.

WSJ: Major League Baseball: Jose Reyes Leaves Mets for Marlins

This is a major request and would eliminate the need for player agents to negotiate for players and also the workload of team contract negotiators and Cap managers.

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Peer-to-peer videos play a major role in our recruiting section for both new and experienced agents.

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