diffraction groupdiffractiongroup衍射: diffraction; inflection群: crowd; group仿射群: affine group直射群: collineation group仿射群概型: affine group scheme下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:衍射群，即可在微信中查询翻译
