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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Last year, while investigating Mr al-Awlaki, federal agents came across Major Hasan's messages to the cleric, but decided not to probe further.

ECONOMIST: The killings at Fort Hood

All this is the more piquant for the fact that it follows so soon after revelations that computer systems at the New York Times, the Washington Post, and other major media organizations have been penetrated by Chinese agents.

FORBES: Nobody Shouted Stop: Alleged Chinese Espionage Swept Under the Carpet

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