Diacaustic
散焦面, 散焦曲线
🗣️ 情景例句
She suffered terribly when her son was killed.
儿子被杀，她痛苦至极。
Who spoke a while ago?
刚才谁在讲话？
wind, earth movements or tremors, and the gravitational pull of the moon and the sun.
风、地球的运动或震颤和月亮、太阳的引力。