Scientists have discoverd that the leaves of acertain type of (plant) contain a kind of medicine.句中的plant为什么不能用plants呢?

Have you got the disc如何翻译 用过去分词形式改写下列句子1 the building fell down immediately after the terrorists attacked it.2.the scientists stopped to have arest because he was tired out.3.if we had given ore attention ,the trees could have grown better.4.the disc Scientists have given many ideas for ______space. fabs(disc) compact disc compact disc checking disc adhere disc 摄像机disc MY DISC DISC是什么 什么是disc? DISC是什么 center disc u-disc 求翻译：Japanese scientists have created a power Scientists have lots of idea 要成单数的哦, Scientists have d_____ that this disease is carried by mice.