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　　词汇解析

　　1.known as 被认为是

　　The resultant defect is known as chromatic aberration.

　　由此而产生的缺陷叫做色差。

　　2.on record 记录在案的;有史以来的

　　It was the coldest winter on record.

　　那是有史以来最冷的冬天。

　　3.long ago 很久以前

　　That warship laid up long ago.

　　那艘军舰很久以前就退役了。

　　4.separated from 分开;分离

　　Her husband only separated from his lady by one of trifling differences.

　　他们夫妻因为小事情不和，所以分居。

　　内容解析

　　1.They said the teeth belonged to a species theycall Panamacebus transitus.

　　belong to 属于

　　I belong to no party.

　　我不属于任何派别。

　　Remittance and collection belong to the commercial credit.

　　汇付和托收属于商业信用。

　　2.When the species lived, South America was not in contact with other continents.

　　in contact with 接触;与...有联系

　　Farm workers frequently come in contact with these insecticides.

　　农场工人常常接触这些杀虫剂。

　　Are you in contact with him now?

　　你现在与他有联系吗?