The leading source of mercury is pollution from coal-burning power plants, which accounts for 40% of all domestic anthropogenic mercury, according to the EPA.
据环保局统计，汞的主要来源是占国内人为排汞量40%的燃煤电厂污染物。
Cement plants are America's fourth-largest source of airborne mercury, generating about 23, 000 pounds (10, 400 kilograms) a year, EPA says.
环境署称，水泥工厂是美国空气中汞污染物的第四大来源，每年产生约23000磅（10400公斤）的汞污染物。
Mercury, that was used to extract gold in amalgamation, is the main source of pollution of the mine environment.
混汞法提金工艺过程中添加的金属汞是某金矿区周围环境汞污染的主要来源。
A common laboratory source of light is provided by a mercury arc.
通常的实验室光源选用汞弧灯。
The stroboscopic light source made of high-power LEDs (higher than 5w) not only can replace the mercury stroboscopic light source, but also can greatly simplify the drive circuit.
采用5w以上的大功率LED构成频闪光源，不仅可以完全替代汞灯频闪光源的功能，而且驱动电路还可以大大简化。
This NAC image shows a close-up view of the apparent source of those rays, a crater 110 kilometers (68 miles) in diameter located in the northern region of Mercury.
窄角镜头拍摄的图像近距离展示了辐射纹清晰可见的源头----位于水星北部区域的一个直径110公里的陨石坑。
This NAC image shows a close-up view of the apparent source of those rays, a crater 110 kilometers (68 miles) in diameter located in the northern region of Mercury.
窄角镜头拍摄的图像近距离展示了辐射纹清晰可见的源头----位于水星北部区域的一个直径110公里的陨石坑。
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