Concentration gradiant
[电] 浓度梯度
🧩 词语组成解析
🗣️ 情景例句
I need some good photos for my advertising, Mr. Stewart.
我做广告需要一些好照片， Stewart先生。
Bill was very jumpy as he waited for the phone to ring.
贝尔忐忑不安地等着电话来。
He asked me some personal questions, but I would never answer them.
他问了我几个个人问题，我根本不愿回答。