unstable
adj
1 likely to move or fall; not firm 很可能移动或跌落的; 不稳的; 不坚固的
an unstable load, eg on a lorry 装得不稳的货物(如卡车上的)
an unstable pile of chairs 一堆放得不牢靠的椅子.
2 likely to change suddenly; unpredictable 很可能突然改变的; 难以预料的
unstable share prices 变化莫测的股票价格
The political situation is highly unstable.政局动荡得很厉害.
3 mentally or emotionally unbalanced(精神或情绪)不平衡的, 波动的
His personality is a little unstable. 他这个人有点反覆无常.
It seems she was in class on Friday afternoon, but no one has seen her since.
好象她星期五还在教室,但从那以后没人看见过她。
The question was, which one?
问题是,哪一种气体导致火灾呢?
To examine your skills and abilities still further, ask yourself this question: in the following three areas - skills with people, skills with information or skills with things - which are your best skills? Note that it is not enough to say to yourself,