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vary
vi.变化 vt.改变
The weather here varies between cool and very hot.
这里的天气变化很大,忽而凉爽忽而酷热。
He varied the games he played with the children so as not to bore them.
他更换和孩子们玩的游戏，以免使他们感到无聊。
various
a.各式各样的
There have been various solutions to the problem.
这个问题有各式各样的解决办法。
variety
n.变化；种类
Peter is a workaholic; his life lacks variety.
彼得是个工作狂;他的生活缺乏变化。
The library offers a wide variety of books to choose from.
图书馆有各类书可供选择。
product
n.产品，成果，结果
The country's main product is timber.
该国的主要产物是木材。
image
n.形象;意象;影像,图像
The aim of this activity is to improve the public image of the politician.
这个活动的目的就是要改善这位政治人物的形象。
You can find images of the spring everywhere in the poem.
你在这首诗里到处可以看到春天的意象。
The images of people at war make me feel uncomfortable.
那些处于战争时期人们的图像让我感到很不舒服。
imagination
n.想象力
Use your imagination and see if you can come up with a better idea.
运用你的想像力，看看你能不能想出更好的办法。
prevent
vt.阻止；预防,避免
Robert's sore legs prevented him from joining the marathon.
罗勃特腿酸使他无法参加马拉松比赛。
Taking necessary precautions will prevent many accidents from happening.
采取必要的预防措施能防止许多意外的发生。
prevention
n.阻止；预防,避免
They organized an association for the prevention of child abuse.
他们组织了一个防止虐童的协会。
Prevention is better than cure.=An ounce of prevention is worth a pound of cure.
预防胜于治疗。——谚语
medical
a.医疗的；内科的
You need a medical checkup before the surgery.
手术前你须要做一次医疗检查。
The hospital has both medical and surgical wards.
这家医院内科病房和外科病房都有。
mention
vt.提及 n.提及
No one mentioned the fact that Harry failed the test again.
没有人提到哈利考试又不及格了。
She is good at playing many musical instruments, not to mention the piano.
她会演奏很多种乐器，钢琴就更不必提了。
In public, Alex made no mention of his private life.
公众场合上，亚利克斯不提及他的私生活。
