1. Before we go any further, it might make sense to require a temporary pause on research into human cloning in order to make a systematic enquiry into the grave questions it raises.
    在我们尚未继续前进之前，最好是先要求暂时停止克隆人类的研究，以便系统地研究它所引发的深刻问题。

2. Then knowledge began to be acctumulated according to a systematic plan.
    于是知识便开始有系统有计划地积累.

3. Then knowledge began to be accumulated according to a systematic plan.
    于是，知识便开始有系统有计划地积累起来。