Radioactive background
[化] 放射性本底
🧩 词语组成解析
🗣️ 情景例句
There's lots of food left.
这里还剩下很多食物。
We have no vacancies now, but we'll certainly bear your application in mind.
我们目前没有空缺，但是我们一定记住你申请的事。
By 1840 about 2,000 Europeans, mainly British, had come to settle in New Zealand and the Maori signed an agreement with these settlers.
截止1840年已有约2，000名欧洲人，其中大部分是英国人，到新西兰定居，毛利人与这些移居者签订了一个协议。