user trial的意思|示意

Due to the converter weight, postures used, and difficulty in installing the converter, a lifting aid was evaluated in a user trial conducted as part of the 1990 study.

由于转炉重量、姿势在安装使用，和困难，变换器起重援助是在用户试验评估以1990年的部分研究。

Of course, this isn’t “lending” in its true sense, it’s just opening up a title to a free trial for another user.

当然，这并不是真正意义上的出租，而只是把扉页出租给其他用户用作免费试用。

User trial in the end is for testing the effects of system performance.

通过用户试用检验了该系统的运行效果。