Definition: a test of something new to find out if it is safe, works correctly, etc. Level: C1
他们正在对一种新药物进行临床试验。
They are conducting a clinical ___trial on a new drug.
她被雇佣，有六个月的试用期。
She was hired for a six-month ___trial period.
我们为新会员提供三个月的免费试用期。
We offer a free three-month ___trial period for new members.
