1. keen,作形容词,意为”渴望,热切,热情的,热心的“等 I wasn't too keen on going to the party.我不太想去参加这次聚会。John was very keen to help.约翰很热心,愿意帮忙。2. keep,作动词,意为”保持,处于“等 Please keep in touch!请保持联系!I'm very sorry to keep you waiting.对不起,让你久等了。3. labor/labour,作名词,意为”劳动,体力劳动,任务,劳动力“等 The price will include the labour and materials.此价格中包含人工费和材料费。Employers are using immigrants as cheap labour.雇主正在把移民当作廉价劳动力使用。4. laboratory/lab,作名词,意为”实验室,实验大楼“ He works in a laboratory.他在实验室工作。There was an explosion in the lab.实验室里发生了爆炸。5. lack,作名词或动词,意为”缺乏,短缺,匮乏,不足,没有“等 There was no lack of volunteers.志愿者不乏其人。She has the determination that her brother lacks.她有决心,而她兄弟却没有。