by twos

每?jī)扇?一組)

call for

要求

come upon

遇到

communicative competence

交際能力

commuter train

市郊往返列車

compete with

與…競(jìng)爭(zhēng)

computer programmer

電腦程序編制員

concentration on

注意力集中于

concern oneself with

研究的對(duì)象是…

concerns over

為…擔(dān)心(憂慮)

confer something on somebody

把…賜予(授予)

conform to

遵守

consist of

由…組成

continental drift

大陸漂移(說)

continental shelf [,kɔnti'nentl ʃelf]

大陸架

contrary to

與…相反

contrast with

與…相比

convection current

對(duì)流循環(huán)氣流

convection zone

對(duì)流層

convert...into...

把…轉(zhuǎn)換成