In this case, unmarked characters (without diacritics) sort ahead of marked characters (with diacritics); diacritics with lower code point values sort ahead of others.
英
美
- 在这种情况下,未标记字符(没有音调符号)先于标记字符(有音调符号)进行排序;具有较低代码点的音调符号最先排序。