One human being in six now lives in a precarious, 每六人中就有一人居于危险
life is precarious. 生命岌岌可危
provide their young with a rather less precarious start in life. 小鸟的幼年过得安全一些
In all of them life manages somehow to keep a precarious hold. 在所有沙漠中 生命总能以某些方式闪现