首先自我推荐：爱因斯坦的英语很烂

我从信的文本而论（我不了解此信的背景），Einstein's "those discoveries"绝对不是指“two great achievements（两项重大成就）”——形式逻辑和系统实验。因为形式逻辑和系统实验其实是方法，西方科学发展是在这两项成就或方法或手段或步骤上取得的。西方的“two great achievements（两项重大成就）”即方法在中国基本上阙如，但仍然可能取得了古代四大发明或类似与西方的发现（不知具体是什么）。

爱因斯坦回信的原文是：

Development of Western science is based on two great achievements: the invention of the formal logical system (in Euclidean geometry) by the Greek philosophers, and the discovery of the possibility to find out causal relationships by systematic experiment (during the Renaissance). In my opinion one has not to be astonished that the Chinese sages have not made those steps. The astonishing thing is that those discoveries were made at all.

Einstein's "those discoveries"为什么不是四大发明或发现 ...

郝炘：也谈爱因斯坦给斯威泽回信的翻译