英语四级经典必背500句：听力口语关键句53 　　53.Im exposed to the thoughts of some of the worlds best writers. 　　四级词汇讲解: 　　expose经常用作被动式be exposed to sth.，其实表示的是主动含义，意为 经常接触 。如: 　　Being exposed to the Internet, he knows a lot about e-commerce.由于经常上网，他对电子商务十分了解。 　　Exposed to sunlight for too long, she suffers from skin cancer.由于暴露在阳光下的时间太长，她患上了皮肤癌。