1、primary
首要的;主要的
That's the primary reason the company's share price has held up so well.
这是公司股票价格一直居高不下的主要原因
。I don't think young people's primary aim in life is to get drunk.
我觉得年轻人生活的主要目标并不是一醉方休
。(教育)初级的,初等的,小学的
Britain did not introduce compulsory primary education until 1880.
直到1880年,英国才开始实行初等义务教育
。Ninety-nine per cent of primary pupils now have hands-on experience of computers.
现在,99%的小学生都亲手操作过电脑
。首先的;最早的;最初的
It is not the primary tumour that kills, but secondary growths elsewhere in the body.
原发性肿瘤并不会置人于死地,致命的是身体其他部位的继发肿瘤
。They have been barred from primary bidding for clients.
他们被禁止对客户进行最初的投标
。2、prevent
防止;预防;阻止
These methods prevent pregnancy.
这些方法能防止怀孕
。Further treatment will prevent cancer from developing.
进一步的治疗将阻止癌症恶化
。阻止;制止;阻碍
He said this would prevent companies from creating new jobs.
他说这将使公司无法创造新的工作机会
。Its nationals may be prevented from leaving the country.
其国民可能会被禁止出境
。