For example, did you know that 1 in 4 teenagers has tried marijuana?
比如,你是否知道4个青少年中就有1位曾经吸过大麻?
After a while,we found a shady place under some poplar trees.
在一会儿以后,我们在一些白杨树下面发现了一块遮阴的地方。
The plane was then able to rise and it cleared the mountains by 400 feet.
于是飞机可以上升了,它在离山头400英尺的高度飞越了过去。