Migrant workers are vulnerable to exploitation.流动工人易受剥削.The area was an important resting place for many types of migrant birds.这个地区是多种候鸟的重要栖息地。Migrant birds shelter in the reeds.候鸟在芦苇丛中筑巢。...
Migrant workers move from country to country in search of work.流动工人为寻找工作, 从一个国家迁移到另一个国家。As a young migrant worker , Lei Gailing sought her fortune in China's fast - industrializing and freewheeling south.作为一名年轻的外来务工...
透镜会把图片放大，就像在看巨大的电视屏幕一样。A lens would magnify the picture so it would be like looking at a large TV screen.这大概是因为胶合透镜会因温度变化而变形.Probably because the cemented lenses are distorted by temperature variations.我们用一块负透镜,它将使光线发散一些...