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1.a number of 大量的；很多
We have lived here quite a number of years.
我们在这儿住了好些年了。
2.lead to 导致；引起
A lack of prudence may lead to financial problems.
不够谨慎可能会导致财政上出现问题。
3.call on 呼吁；访问
I call on everyone to renounce the use of violence and armed struggle.
我呼吁每个人都放弃使用暴力和武装斗争。
4.keep out of 使不进入；把…挡在…外
People can keep out of the sun to avoid skin cancer.
人们可以通过避免阳光照射来预防皮肤癌。
