He once tried to put in a brighter light in his bedroom,but he made a mistake.
翻译成“他曾尝试过在自己的卧室里放置一个更亮的灯，但是他犯了一个错误。”
句子中关键词语和词组解释如下：
once 英[w?ns] 美[w?ns]
adv. 一旦; 曾经; 一次，一趟; 一倍;
conj. 一旦…就…; 一经;
n. 一次，一回;
[例句]I met Wilma once, briefly
我曾经和威尔玛有过短短的一面之缘。
try to 英[trai tu:] 美[tra? tu]
[词典] 设法;
[例句]One child shrinks away from me when I try to talk to him
当我试图和一个孩子说话时，他避开了我。
put in 英[put in] 美[p?t ?n]
[词典] 做; （使） 在内; 在…上花费; 选举…执政;
[例句]Wade was going to be paid a salary, instead of by the hour, whether he put inforty hours or not
会按月给韦德开工资，而不是按小时，无论他是否工作了40个小时。
brighter
adj. 聪明的( bright的比较级 ); 光亮的; 辉煌的; 前途光明的;
[例句]I was convinced that he was brighter than average.
我确信他比一般人聪明。
make a mistake 英[meik ei mis?teik] 美[mek e m?stek]
[词典] 犯错误; 弄错;
[例句]I'd always played a defensive game, waiting for my opponent to make a mistake.
我总是采取防守型的打法，等待对手出错。