在野外

Teachers often chaperon their classes on field trips.

郊游时老师常看护着班上的学生。

Jobless and penniless, he had to sleep rough in the fields for several months.

他既无工作又无钱, 只好露宿数月。

A farmer works outdoors.

农民活。

Just 600 wisent remain in the wild nearly all of them here—or just half depending on what's meant by here.

只有六百头欧洲牛还生存，它们几乎全部集中这里——或者一半集中这里吧，这取决于我们如何定义“这里”这个词。

The Microtremor Survey Method use Microtremor observation to distill surface wave, obtain it's dispersion curve and then get inversion to the underground structure.

微动勘探法是设置一个观测台阵记录微动信号,然后从观测到的微动信号中提取面波,得到面波的频散曲线,最后用频散曲线反演地质结构。