1·I think there are two main reasons, one is the policy of the society of Jesus in china changed, so that the missionaries could not introduce western scientific knowledge to Chinese again;
这中的原因，我们认为并是由于《几何原本》前六卷当时的影响不大，而是：、当时的环境产生了改变，西方传士再不能随意向国人传授西方技；