1.a cause for concern 令人擔心的;引起關注
The state of the country's jails was a cause for concern.
這個國家監獄的狀況令人擔心 。
2.drawback 缺點
He felt the apartment's only drawback was that it was too small.
他感覺這個公寓惟一的缺點就是太小 。
3.unfulfilled 未實現的
Do you have any unfulfilled ambitions?
你有什么未實現的抱負嗎?
4.simmer 即將爆發
This argument has been simmering for months.
這場爭論已醞釀了幾個月了 。