on request ,on a request ,in request

on request ,on a request ,in request on request的近义词 price on request什么意思 Refrigerator on request 咋翻这东西? 求翻译：furnish on request He refused the request on moral grounds 请问on request的中文意思 .provided on request.对应中文应是什么? 翻译：Other specification available on request after hours on request什么意思 a request for advice Water is served only on request in this restaurant .这句话翻译