英语语法分析

This is a key topic for the first time to buy moire stone friends.

这一点对于头次购买龟纹石的朋友是一个关键话题。

For the first time to buy moire stone should pay attention to what?

对于第一次购买龟纹石时应该注意哪些方面呢？

Moire stone surface horizontal turbulence, similar to the shell texture.

龟纹石表面横竖乱纹，类似龟壳上的纹理。