We couldn't understand them because they were talking in Chinese.
我们听不懂他们在讲些什么，因为他们说的是汉语。
His school work is suffering because of family problems.
由于家庭问题，他的'学业日渐退步。
Two players are out of the team because of injury.
两名队员因伤退出了比赛。
We have had to raise our prices because of rising costs.
因为成本日益上涨，我们不得不提高价格。
His school work is suffering because of family problems.
由于家庭问题，他的学业日渐退步。