重点讲解：
1. shield sb. from sth. 保护；掩护；庇护；
例句：He shielded his head from the sun with an old sack.
他用一只旧口袋挡住头顶的阳光Ta@(@oloI~UyLU,Ibs|f。
2. be exposed to 使暴露于（险境）；使遭受（危险或不快）； 使接触；
例句：They had not been exposed to most diseases common to urban populations.
城市人口中多数常见的疾病他们都没有接触到mfxq#gD.IVmn*R。
3. as well as 除…之外；也；还；
例句：We go there to relax as well as to keep fit.
我们去那儿让自己放松心情以及保持健康qf=DroAKf|r)。
4. on display 展示；展览；陈列；
例句：ost of the other artists whose work is on display were his pupils or colleagues.
其他参展的艺术家大多是他的学生或同事Co9NIGr@R0(!V4O。
5. by hand 用手工；
例句：Each pleat was stitched in place by hand.
每条褶裥都是手工缝制到位的&_=UD@b&vLHrH-;31。