4-methoxybenzyl-3-chloromethyl-7-12-pheny ( acetamido)-3-cephem-4-carboxylate是什么意思_4-methoxybenzyl-3-chloromethyl-7-12-pheny ( acetamido)-3-cephem-4-carboxylate在线翻译_英语_读音_用法_例句