An international team of scientists is working to identify the hosts of the virus and mode of its natural transmission in the environment.

一个国际科学家小组正在努力查明病毒的宿主及其在环境中的自然传播方式。

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WHO is working with the Ministry of Health in Yemen to ensure that AFP surveillance throughout the country is sensitized so that no transmission of wild poliovirus is missed.

世卫组织正在与也门卫生部一起努力确保在整个国家宣传急性弛缓性麻痹监测，以便不使野生脊髓灰质炎病毒的传播遗漏。

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If there are too many problems with your car (broken headlights, alternator not working, transmission failing), it might be wiser to get a new car.

如果您的车有太多的问题(车头灯坏了，发电机失效，变速器失灵)，那么购买一辆新车也许更明智一些。

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For example, engineers working on a transmission or engine can simply walk down a hallway to get a question answered as opposed to calling someone in a different location and time zone, Winegarden said.

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It had a four-speed transmission and fully working transfer case, so you could switch from two- to four-wheel drive.

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Sorry, it's about to get all geeky in here: The longitudinally midmounted V8 transfers power to the limited-slip e-diff through a Koenigsegg-designed seven-speed gearbox, with a twin-disc dry clutch and an 11-disc wet clutch arranged sequentially, working cooperatively, rather like a dual-clutch automated manual transmission.

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