1.be covered in 被...覆蓋
It could, too, be covered in oceans, perhaps completely.
這顆行星也可能完全被海洋覆蓋。
2.expose to 暴露于
The pollution of drinking water make people expose to the inorganic arsenic and cause the chronic arsenic poisoning.
工業(yè)污染及水源污染使人暴露于無機(jī)砷的環(huán)境,導(dǎo)致慢性砷中毒。