The score calls for a contralto.

乐谱要求一个女低音歌手。

The situation calls for prompt action.

目前的形势需要立即采取行动。

There were calls for major changes to the welfare system.

有人要求对福利制度进行重大改革。

There have been calls for a new kind of security arrangement.

有人要求采用新型的安保措施。

It's a situation that calls for a blend of delicacy and force.

这种情况下需要的是刚柔并济。