In fact, a device using "surface-enhanced Raman spectroscopy" can detect traces of less than one part per billion.

实际上，利用“表面增强拉曼光谱”的设备能够检测到十亿分之一的痕量物质。

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In fact, a device using "surface-enhanced Raman spectroscopy" can detect traces of less than one part per billion.

实际上，利用“表面增强拉曼光谱”的设备能够检测到十亿分之一的痕量物质。

youdao