finely collimated x ray beamfinely collimated x-ray beam窄: narrow准直: alignment; collimationx: vt. (x-ed, x'd x-ing, x'ing) ...β射线: beta ray束: bind; tie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:窄准直x射线束，即可在微信中查询翻译
