本文从几个方面介绍了外来务工人员面临的健康威胁。
This article describes several aspects of threats to migrant-workers' health.
介绍了数字图像处理技术的背景和意义，从几个方面说明了图像处理的过程和技巧。
This paper introduces the background and significance of digital image processing technology, and illustrates the procedures and techniques of image processing from several aspects.
从微生物浸铜、铀、金及其他金属几个方面介绍了生物浸矿技术的研究状况，展望了生物浸矿技术的发展前景。
In this paper research on this technology is conducted in several aspects, such as bioleaching copper, uranium, aurum, and other metals the development prospects are forecasted.
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