这两句英语有错误吗?（1）This research is rare except he proposed a meth
这两句英语有错误吗?
（1）This research is rare except he proposed a method.
这句话有错误吗?表达某一研究很少见,只有某人提出了一种方法.
（2）A lot of investigation and research work have been down.
请问这个down用什么词替换比较好?
（1）This research is rare except he proposed a method.
这句话有错误吗?表达某一研究很少见,只有某人提出了一种方法.
（2）A lot of investigation and research work have been down.
请问这个down用什么词替换比较好?
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