What would you say was the root cause of the problem?

　　你認為問(wèn)題的根源是什么？

　　The research was carried out on a modest scale.

　　這個(gè)研究項目開(kāi)展的規模不算太大。

　　The experiments were carried out under simulated examination conditions.

　　試驗是在模擬的情況下進(jìn)行的。

　　It is impossible to calculate what influence he had on her life.

　　現在無(wú)法估計他對她的生活產(chǎn)生過(guò)多大影響。

　　Fees are calculated on a sliding scale according to income.

　　按浮動(dòng)費率制根據收入高低計算收費。