Age-specific

age [edʒ]

n. 年龄;时代;老年;年龄段; vt.& vi. （使）长大;使显老;使变老;使苍老; vi. [化学]老化;陈化，熟化;（吸毒者随年龄增长而主动）戒毒，戒除毒品; vt. [化学]使老化;使陈化;使熟化;估计，推测（马的年龄）;

specific [spə'sɪfɪk]

adj. 明确的;特种的;具体的;[免疫学]特效的; n. 特效药;特性;细节;显著的性质，特性;

speci种类+fic带来→带来外观的→具体的

I arrived there without any delay.

我顺利抵达。

It's a poor mouse that has only on hole.

鼠只有一洞，必先把命送。

We set off down the hill. At first it was easy walking over the grass. Then the grass turned to bushes and the hillside became steeper. We climbed over rocks, through trees and found it more and more difficult to get down the hill. By now we were beginnin

我们开始下山，起初很容易地走过草地，后来草地变成了灌木丛，山峰变得更陡了。我们爬过岩石，穿过树林，发现下山越来越难。这时我们感到疲惫，雨也下大了。我在一小块草地上停下来，转身看看跟在我后面的弟弟。就在这时我在两块岩石中间发现了一个洞。“我过去看看，”我喊?2282