in default of

因缺少, 在缺乏 ... 时

例句与用法：

In default of tools, he uses a knife.

因没有工具，他使用一把刀子。

In default of tools, she used a hairpin and a buttonhook.

因没有工具，她使用一支发针及一钮钩。

He was acquitted in default of strong evidence of his guilt.

因无确凿证据而判他无罪。

The committee will not meet in default of a chairman.

没有主席委员会就不开会。

详细释义：

因缺少

In default of expert's help, you'll have to rely on yourselves.

没有专家的帮助, 你们只好依靠自己了。