Many drugs were found by trial and error

　　很多藥物都是通過(guò)反復試驗才發(fā)現的。

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

　　我們計劃今年秋天在各醫院推出一個(gè)模型進(jìn)行試驗。

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

　　這個(gè)制度已引進(jìn)試行一個(gè)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.

　　預計審判要持續三個(gè)月。