Tacinvariant
互[相]切不变式
🗣️ 情景例句
An oil tanker ran aground and lost about 15,000 gallons of gas into the sea.
一般油轮搁浅，把 15000 加仑油倾泻在海里了。
Your beautiful handwriting puts my untidy scrawl to shame.
你那漂亮的书法使我潦草的字迹相形见绌。
It's cheaper, isn't it?
这更便宜些，是吗？