The preparation process includes the main steps of preparing material, dry ball milling, regulating material and ageing, sieving and pelletizing.

制备工艺主要包括配料、干法球磨、调料陈腐、过筛造 粒工序；

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However, highly optical pure PLA could easily crystallize leading to the difficulty in preparing material with one or two dimensional orientational ordering.

但是纯态的聚乳酸容易结晶，难以制备在一维和二维取向有序的材料。

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I could make any mistake when preparing this material for publication, there can be some not discovered bugs in both my hardware and software.

当准备材料发表这篇文章时，我可能犯下任何错误，硬件和软件上都有可能有未被发现的漏洞。

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But popular groups not quite big enough to make the "Rock Band" playlist are also preparing material for the do-it-yourself upload store, including Creed and Evanescence, each of which has sold tens of millions of albums in the past decade.

WSJ: MTV Games Seeks Buzz for 'Rock Band'