respiratory effort是什么意思

respiratory effort是什么意思 respiratory effort respiratory cultures是什么意思22222 message,effort是可数名词吗 为什么【effort努力】是可数名词? effort是可数名词还是不可数名词? effort的用法.she sometimes asked herself the question whether it was worth the effort.这里effort是名词嘛? 应该是much effort 还是many efforts是much effort 还是many efforts 请大家帮忙下一篇英文文献!文献名是：isolation of mouse respiratory epithelial cells and exposure to experimental acigarette smoke at liquid interface effort作啥解释是可数啥解释是不可数? 努力到底是用with effort 还是with efforts spare no effort to do sth 是固定用法吗? he puts all his effort into practicing,he puts all his effort into practice.两句话哪一个是对的 the effort effort是什么意思? effort意思 placebo effort