There is a growing tendency among employers to hire casual staff.

雇主雇用临时职员有增加的趋势。

《牛津词典》

But we take on casual staff when we need them.

但有需要时我们也会雇临时工。

youdao

We have five hundred full-time workers, but we take on casual staff when we need then.

我们有五百个全职员工，但当我们有需要是我们会雇佣临时工。

youdao

Railway workers have voted in favour of strike action over the use of casual staff by Northern Rail.

BBC: Northern Rail staff vote for strike over contracts

Trade unions have welcomed the move, but some employers say it could discourage firms from hiring casual staff.

BBC: Agency workers receive pay and conditions boost

The posts that have been lost are mainly casual staff, but Mr Neill said if the situation continues "it will be full time employees" that are affected.

BBC: Northern Ireland