Variscope
彩色摄影器
🗣️ 情景例句
Don't be so grumpy.
别总这么爱抱怨。
I'm not sure what time I'm coming back.
我不肯定我什么时间回来。
Many firms, for instance, have great difficulty in obtaining technical or scientific books from libraries
比如，很多公司向图书馆借阅科技书籍时感到很困难，