英语翻译Medical research are painfully aware that there are many problems （to which they have no answers yet till now）他们至今还没有答案 这里的to为什么要至前啊?还有那个till换成untill可以吗?answer一般都要加s吗

初中英语翻译：The old in the home for the elder are taken to the hospital for medical research. 英语翻译Medical Examination ... 英语翻译翻译seriou.medical. 英语翻译ll medical advice what can medical research hilp according to the passage翻译 翻译 As some machines used for medical and research purposes. 英语翻译These extremely expensive flights into space have been proved rewarding.Their inmediate benefits can be found in weather and communications satellites,medical engineering and climate research. 英语翻译The loss to the medical research community is incalculable.As one grieving colleagueput it:‘What ifthe cure for AIDS was on that plane?’” 英语翻译Something is___________the medical care 英语翻译Mozart the medical profession 英语翻译ll medical advice谢谢 英语翻译Top Medical Research Institute in USA,Molecular biology,Saving Private Ryan,The Magic of Thinking Big ,Live in Philadelphia suburb ,My house is 2 hours from New York city)I am a Canadian citizen working in a Top Medical Research Institute medical 英语翻译propolis tablets have a composition of over 300 elements covering the compounds of flavones.terpene.vitamin and microelements,worldwide scientific and medical research has demonstrated the use of propolis in immunity improvement and antio 帮我解一下题目：1.He did a lot of medical research _____ cancer 英语翻译research into a disease. research Research