万一

I took the precaution of locking money in the safe.

我把所有的钱都锁在保险箱里一。

There is a supplementary water supply in case the rain supply fails.

一主水源断了, 我们另外有供水的地方。

Although the sun was shining,I took an umbrella to be on the safe side.

虽然有太阳,但我仍带了伞一。

When the frequency changer has malfunction, power frequency is adopted, and the motor speed is nonadjustable.

一变频器出故障时，可工频驱，不可调。

What if he's your rhumba boy?

一他就是你那伦巴男孩呢？

There will also be an 'underboss' who can run things should the 'boss' get thrown in the 'slammer'.

“头目”一被抓进“班房”,这里还有一个“代理头目”来打理事情。