Pentabromide
五溴化物
🗣️ 情景例句
I researched it for over a year.
我研究了一年多。
I cannot afford two days off a week.
我忙得无法一星期抽出两天休假。
This time it was the postman and he wanted me to sign for a registered letter!
这次是邮递员，他要我签收一封挂号信！