Research progress is introduced at first in this paper.

本文首先介绍了课题研究进展情况。

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The components and their functions of UV curing coatings were introduced at first.

介绍了紫外（UV）光固化涂料的组成（包括光引发剂、活性单体、齐聚物、助剂）及其作用。

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In this article, PLL theory, design of loop filter and phase noise theory are introduced at first.

本文先介绍了锁相环的工作原理，环路滤波器的设计并对相位噪声的理论进行了阐述。

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Though only about 100 stations will be introduced at first, they will drive down petrol prices in surrounding areas.

ECONOMIST: Japan��s oil industry: Help yourself | The

Through a few hardware changes, Samsung compressed the device, which was first introduced at the Mobile World Congress trade show in mid-February, to a width of 8.6 millimeters.

FORBES: Behind Samsung's Tablet Redesign: We Won't Be Outdone By Apple

The Fiat 126 was first introduced in 1972 at the Turin Motor Show as a replacement to the Fiat 500.

FORBES: Ostalgia the New Museum: Simon Starling's Polski Fiat