Conservation of matter
[化] 物量守恒; 物质常住
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
matter
['mætɚ]
n. 事件;（讨论、考虑等的）问题;重要性;物质;
vi. 要紧，重要;化脓;有重大影响;有重要性;
🗣️ 情景例句
And the marketing of new toys and games.
还有新玩具和新游戏器具的行销。
Will you take that library book back for me?
你能帮我把书还回图书馆吗？
In summer it is often too hot, and in winter it is too cold.
夏天常常太热，冬天又常常太冷。