This paper retrospects to the developing history and usage status of radioisotope thermoelectric generator (RTG) used in space in the 20th century.

重点回顾了20世纪放射性同位素电池的研发历史和空间发射现状；

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The developing history, molecular character, biological effects of free radicals and the functions of scavengers for free radicals were reviewed in this paper.

综述了生物自由基的研究简史、分子基础、生物学效应及自由基清除系统的功能特性。

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The author points out that the developing history of the concepts on the polyphonic fiction is a symbol of the forming process of modern fiction in its structure patterns.

作者指出，“复调小说”在概念内涵上由内容到形式再到文体的延扩史，象征了现代小说结构模式的演变过程；

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For the first time in the bank's history candidates from developing countries mounted a challenge to an American nominee, though in the end Mr Kim was backed by China, India, Mexico and other big emerging markets.

ECONOMIST: Business this week

There are also many new novels that, like To Kill a Mockingbird, illuminate social issues not by writing through the broad strokes of history but by developing powerful characters who battle events over which they have little or no control.

FORBES: The Novel as Agent for Social Change

The company is also developing a test to assess the risk of autism in children with no family history of the condition.

WSJ: Why Kids Get Autism: New Genetic Clues