n.视力；影像；眼光；先见；远见

　　I wear glasses to improve my vision.

　　我戴眼镜以改善我的视力。

　　It is said that the children saw a vision of an angel here.

　　据说这些孩子在这里看到天使的影像。

　　The mayor had a vision of changing this area into a lovely park.

　　这位市长很有眼光要把这个地区改建成一座美丽的公园。

　　A great leader must be a person of vision.

　　伟大的领袖必须是个有远见的人。

　　visible

　　a.肉眼可见的；显而易见的

　　The building was visible through the trees.

　　从这片树林望出去可看见那栋建筑物。

　　There's been a visible change in him since he started exercising.

　　自从开始运动后，他有了明显的改变。

　　exchange

　　vt. n.交换

　　I love to exchange stamps with my friends.

　　我喜欢和朋友交换邮票。

　　Peter exchanged his toy car for a toy gun.

　　彼得用玩具车换了一把玩具枪。

　　I gave him a pen i exchange for his watch.

　　我用一支笔和他换一只手表。

　　practical

　　a.实际的；常规，习俗

　　This job calls for at least five years of practical experience.

　　这份工作需要至少5年的实际经验。

　　Tom is a practical person and never does things beyond his ability.

　　汤姆是很务实的人，超过自己能力的事他从不会去做。

　　practically

　　adv.实际地

　　Practically speaking, he isn't cut out for the job.

　　讲得实际一点，这份工作他不能胜任。

　　mend

　　vt.修理,修补；改正

　　The thrifty man mends his own clothes, including torn socks.

　　这个节俭的男子会修补自己的衣服，包括穿破的袜子。

　　Least said, soonest mended.

　　少说为妙，越描越黑。——谚语

　　constant

　　a.持续的；稳定的

　　The constant noise of the machine is driving me crazy.

　　机器不断发出的噪音快把我逼疯了。

　　The weather has been constant this week.

　　这星期的天气很稳定。

　　constantly

　　adv.经常地

　　The old woman is constantly complaining.

　　那位老妇人经常抱怨。

　　disease

　　n.疾病

　　Mosquitoes spread diseases such as malaria.

　　蚊子会传染像疟疾这样的疾病。

　　electric

　　a.电的；用电操作的

　　Bob got an electric shock from the wire.

　　鲍伯被电线电到了。

　　Life wouldn't be so comfortable without such electric appliances as refrigerators and TV sets.

　　若没有电视和电冰箱等电器，生活是不会那么舒适的。