To be done with this effort is indispensable condition of secure and lasting happiness.

放弃'这种努力是获得长久快乐必不可少的条件.

互联网

The ability of capital flow is an indispensable condition to maintain steadfast management of capital.

资本流动能力是资本稳健经营的不可或缺的条件.

互联网

It is well known that knowledge is the indispensable condition for expansion of the mind.

众所周知,知识是发展智力的必备条件.

互联网