Background impurity
[化] 本底杂质
🧩 词语组成解析
🗣️ 情景例句
What I eat won't stay down.
我吃东西时感到恶心。
Martha will expect you to come by at six o'clock for dinner.
玛莎以为你在六点以前会来吃晚饭。
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。