Apochromatism
复消色差
🗣️ 情景例句
Will you come over to help me with the tough job?
您能否来帮助我做这项艰苦的工作？
Industry is fortune's right hand, and frugality her left.
勤勉是幸运的右手，节约是幸运的左手。
U.S.A.
美国