They have （had看时态等而定）to learn how to adapt to new environment, how to get along with teachers and classmates. Without water, humans can not survive.
汉译英：他们不得不学会如何适应新的环境,如何与老师和同学相处.要是没有水,人类将无法生存.
They have （had看时态等而定）to learn how to adapt to new environment, how to get along with teachers and classmates. Without water, humans can not survive.