相反，针叶树将侵入白杨树林的边界，越来越多地遮挡白杨所需的阳光。

Instead, coniferous trees will invade the aspen grove's borders and increasingly block out sunlight needed by the aspens.

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在其它情况下，常规医疗仅在紧急情况下和安全地非侵入式的、非药物的疗法失败的情况下被使用。

In other cases, "conventional" medicine is only needed in emergencies or when the safer non-invasive, non-pharmaceutical methods fail.

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温哥华的城市和交通生硬地侵入到我的视线中。

The city of Vancouver and its sudden traffic steals into view.

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As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.

有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播

耶鲁公开课 - 生物医学工程探索课程节选