Impurity semiconductor
[电] 杂质半导体
🧩 词语组成解析
🗣️ 情景例句
having to take care of the baby all weekend.
整个周末照顾孩子。
To wave your arms
振臂，挥手
Dressed in dark glasses and old clothes, they had taken special precautions so that no one should recognize them.
他们戴着墨镜，穿着旧衣裳，特别小心以防别人认出他们。