Christine's class entered a math contest with Mary’s class.克里斯蒂娜的班级与玛丽的班级进行了一次数学竞赛。

context n.上下文，语境

It is easier to tell the meaning of a word from its context than to do this just from a word list.在语境中猜一个单词的意思比在单词表中容易。

contract v.①收缩②订契约，立合同

Metal cwirracls as it cools.金属冷却时体积会缩小。

His firm has contracted to supply all the furniture for the new building.他的公司承包了为新大楼提供所有家具的业务。

contrast n.对照之后的悬殊差别

Today's rain is a sharp contrast to yesterday's sunshine.今天的降雨与昨天的阳光明媚形成了 鲜明对比。

The mansion contrasted with the small houses that surrounded it.这栋大厦与周围的小房子形成鲜 明对比。

controvers n. 争论，辩论

There was a big controversy the use of drugs in athletics.对于竞技体育中的药物使用还存在巨大的争议。

convenient adj.便利的；方便的

Tom picked a convenient time to come for a visit.汤姆选择了一个方便的时间过来参观。

convention n.会议；传统

The medical association usually holds a large convention in a major city.这个医学会通常都会在一个大城市召开大型会议。

The convention was held to discuss new things in medicine.会议的目的是讨论医学中的新进展。

convert vt.转换；转变信仰

I converted the spare bedroom into a study.我将空着的卧室改成广书房。

convict vt.证明…有罪，宣告…有罪

The attorney declined the client because he believed that the client would be convicted of the crime he was charged with.律师拒绝了那位客户，因为他认为那位客户被指控的罪名可能成立。

convince vt.使确信，使信服

He managed to convince the jury of his innocence.他设法让陪审团相信自己是无辜的。