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

　　你認為問題的根源是什么？

　　The research was carried out on a modest scale.

　　這個研究項目開展的規(guī)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行的。

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

　　現(xiàn)在無法估計他對她的生活產(chǎn)生過多大影響。

　　Fees are calculated on a sliding scale according to income.

　　按浮動費率制根據(jù)收入高低計算收費。