adj. 安全的;保险的,肯定的;无损的;提供保护的;
n. 保险箱,保险柜;冷藏箱;〈俚〉避孕套;
🗣️ 情景例句
Because the job was not challenging enough.
因为那份工作挑战性不够。
They don't know when the wedding will be.
他们不知道婚礼将是什么时候。
I'm not sure. I ought to do some studying, as I've got masses of work to do, but I think I'll be too tired. Maybe I'll just watch the news on television and go to bed early.