1. The Love Family is either too casual for children — your friends have no obligation to provide for them — or it's too unstable, with adults moving on if the relationship no longer answers their search for perfect happiness.
    "情爱家庭"对孩子来说，要么太随意 —— 新的伴侣对你的孩子没有抚养责任，要么太不稳定，成年人一旦感到他们的关系无法满足自己对完美幸福的追求，就会转而他求。

2. He has got an unstable mind.
    他思想很不稳定。

3. If it were gentle, only the more unstable rods fell.
    如果地震轻微，只有不稳定的木棒倒下；

4. In any case, its basic construction made it unstable.
    不管怎么说，小船的结构自身就不太安稳，