Tacinvariant
互[相]切不变式
🗣️ 情景例句
You're writing a book?
你在写一本书吗?
I'll finish working at 5:30 and get home by 6 o'clock.
我希望在5:30完成工作并且在6点钟回家。
but, so far, the archaeologists have been unable to discover her identity.
不过，考古工作者至今未能确定这位女神的身份。