Acheson graphite
[化] 艾奇逊石墨
🧩 词语组成解析
艾奇逊(①姓氏 ②Dean Gooderham, 1893-1971, 于1949-1953年任美国国务卿)
🗣️ 情景例句
I'm going to party after exams.
考试结束后，我要去聚会。
Would he have seen you if you hadn't waved to him?
如果你没向他招手他会看见你吗？
The further off this solid obstruction, the longer time will elapse for the return of the echo.
固体障碍物越远。回声返回所用时间就越长。