Australia banned private colleges from new overseas students . Officials found visa misuse and weak teaching in schools . Public universities can still accept international students . Some students worked instead of studying in class . Regulators will check schools and visa rules . Some colleges gave certificates with little study . More students put pressure on housing . Schools depend on international student income . Visa approvals dropped for some countries . Fewer students may hurt the economy .

Phrases:

across the country . 全國 . depend on . 依賴 . even though . 即使 . in the future . 在未來 . instead of . 而不是 . recent years . 近年來 .