Picknometer

比重瓶

🗣️ 情景例句

who really needs to be wearing a tuxedo,
真正需要穿燕尾服的人,
Ill-gotten wealth never thrives.
悖入悖出。
for fear the agents of other firms should be able to trace the kind of research they are likely to be undertaking.
他们生怕别的公司的情报人员据此摸到他们可能要从事的某项科研项目。
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