amplify, enlarge, stretch, magnify, reinforce, expand的区别
amplify v.扩大，增加，尤其指通过增强电压或电流使声音扩大；补充叙述(故事、事件等)。
we must ask you to amplify your statement.
我们得请你对你的说法作进一步的说明。
enlarge v.扩大，多指具体物品如相片的放大。
enlarge photograph 放大照片
enlarge a house 扩建房屋
stretch v. (有弹性地)伸展，延伸，并有可能超过限度；伸长、伸出(身体某部位)并绷紧肌肉(尤指在放松后或为了够着某物)。
the pullover stretched after i had worn it a few times.
这件套头毛衣我穿了几次之后就撑大了。
having finished their morning work, the clerks stood up behind their desks, stretching themselves.
完成了早间工作之后，职员们站到桌子后面伸伸懒腰。