Rectigradation
直线渐变
🗣️ 情景例句
If you're under twenty-one years of age ...
如果你还不到二十一岁……
The mother's heart is the child's schoolroom.
母亲的心肠是孩子的课堂。
Plenty of sleep is healthful.
充足的睡眠有益于健康。