短期临时工和长期临时工，用英语怎么说？

temporary worker 已包含短期的意思。
contractor 有长期临时工的意思，合同工,非固定职员。

short-term irregular worker(part-time worker.)短期临时工

long-term irregular worker(part-time worker.)长期临时工

短期临时工 - short-term contract worker (short-term part-time worker)
长期临时工 - long-term contract worker (long-term part-time worker)

Short-term temporary worker
long-term temprary worker

short-term temprary worker
long-term temprary worker