The most difficult part of the project—pulling data from three sources and combining it into a format that typical tools can use—is now finished, and it wasn't so difficult.
项目最困难的部分 — 从三个源抽取数据并组合成典型工具可以使用的格式 — 现在已经完成，其实并不是很难。
The difficult part is making up our minds now.
然而，当前我们面临的一个困难问题是转变我们的思想。
Well, I wish you luck with that and we now go to a way more difficult part of multiplication and that is vector multiplication which is called "the vector product."
好了，祝你们好运，下面我们来讲，更难的乘法运算，是矢量的乘法运算，我们称之为“矢量积。”
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