这个男孩是他不稳定的第一步。

The boy was unsteady at his first step.

youdao

他认为失业会引起社会不稳定。

He believes that unemployment is socially divisive.

《牛津词典》

他没有考虑到自己不稳定的职业前景。

He did not speculate on the future of his tenuous career.

《柯林斯英汉双解大词典》

And then he says the tetrachloride will be volatile, 9 and it will have a density of 1.9.

他说四氯化物具有不稳定性，密度是1。

麻省理工公开课 - 固态化学导论课程节选