The teacher cast about for a better example.

老师在思索一个更好的例子。

I also cast about for some means of warning him.

我也想寻找些方法来警告他。

We cast about for any beliefs we can call our own.

我们寻找着任何可以称之为我们自己的信仰。

Therefore, ore prospecting was cast about for source bed.

因此，找矿重点是寻找矿源层。

She cast about for some excuse for refusing his proposal.

她设法寻找借口来拒绝他求婚。