Ecosystems changeover time, with or without the involvement of mankind, so no one can tell what Hawaii should look like.
不管有没有人类的影响，生态系统都会随时间演变，因此没有人可以说出夏威夷看起来应该是什么样的。
2
In this study, instead of teaching students that their smartness can change, we taught them that their social standing—that is, whether they are bullied or excluded or left out—can changeover time.