Echelle
阶梯(分级)光栅
🗣️ 情景例句
Why does it have to be one or the other?
为什么非得有这个就没有那个？
If the blind lead the blind, both shall fall into the ditch.
问道于盲，无益于事。
It took years of hard work to speak good English.
讲一口流利的英语需要多年的刻苦操练。