该当

You’ve missed your vocation, Mary, you should have been a nurse!

你找错了行当, 玛丽, 你该当护士。

In addition, the product should be kept in temperature and humidity relatively stable environments, overdried or over-wet will cause a change in the appearance quality of books.

不兴此之外，制品该当保不干度不绝差安定的境况洋，功潮或功干市引起册本表背质量的保持。