Halochromy
加酸显色现象
🗣️ 情景例句
Which band of College English Test have you passed?
大学英语考试过了几级？
How much is the admisssion fee?
入场费要多少钱？
Only good scouting is likely to preserve the freedoms so dear to the heart of the eternal Boy Scout.
只有优良的童子军活动才能保持不朽的童子军所衷心热爱的各项自由。