在野外

Teachers often chaperon their classes on field trips.

在外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, 只好在外露宿数月。

A farmer works outdoors.

农民在外干活。

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

只有六百头欧洲在外生存，它们几乎全部集中在——或者一半集中在吧，取决于我们如何定义“”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.

微动勘探法是通过在外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。