A certain amount of care or

A certain amount of care or pain or trouble is necessary

for every man at all times.

A ship without a ballast is unstable

and will not go straight.

一定的忧愁、痛苦或烦恼，对每个人都是时时必需的 .

一艘船假如没有压舱物，便不会稳定，

不能朝着目的地一直前进 .