negative contact agent负: burden; load接触剂: contact agent接触剂: catalyser; catalyst; catalytic agent; catalyzer; contact agent; contact beam; contact substance化学接触剂: chemical contact agent接触剂, 催化剂: contact substance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:负接触剂,即可在微信中查询翻译