Many drugs were found by trial and error

　　很多藥物都是通過反復(fù)試驗才發(fā)現(xiàn)的。

　　We plan to release a prototype this autumn for trial in hospitals.

　　我們計劃今年秋天在各醫(yī)院推出一個模型進行試驗。

　　The system was introduced on a trial basis for one month.

　　這個制度已引進試行一個月。

　　The date of the trial has been advanced by one week.

　　審判日期提前了一星期。

　　The trial is expected to continue for three months.

　　預(yù)計審判要持續(xù)三個月。