🧩 词语组成解析
abbr. 研究与开发处（Office for Research and Development）；运筹学部（Operational Research Division0；旋光色散谱, 旋光分散作用（Optical Rotatory Dispersion）
kangaroo
[,kæŋɡə'ru]
n. [动]袋鼠;
rat
[ræt]
n. 大老鼠;似鼠动物;<非正式>鼠辈，卑鄙小人;
vi. 捕鼠;<俚>背叛，告密;
🗣️ 情景例句
What was your GPA last semester?
你上个学期的平均成绩是多少？
I invited him to come in, but he wouldn't.
我请他进来，但是他不肯。
Yes, I have.I was there in April.
是的，我去过。4月份我在那儿。