When lunch is finished, Jack returns to school for afternoon lessons, and then goes home again for dinner in the evening.
吃过午饭，杰克回到学校上下午的课，然后晚上再回家吃晚饭。
cd /usr/local goes there. cd ~ goes to the home directory of the person logged in--e.g., /usr/home/jack.
cd /usr/local表示到/usr/local目录. cd ~去登陆用户的home目录——比如，/usr/home/jack。
Jack goes to school. Mary stays at home.
杰克上学。玛丽在家。
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