Or keep the seedlings fully exposed to outdoor weather conditions – for short, but increasing periods.

或者干脆把幼苗暴置于室外环境中——暴置的时间要短，每次逐渐加长时间。

Australia is increasing the time period some students can work for after graduating from two to four years.

澳大利亚正在将一些学生毕业后可以留下工作的时间从两年增加到四年。