The composition of oxygen isotope is a good tool to trace the origin and formation environment of sulfate.

氧同位素组成是一个非常有效的示踪硫酸盐的起源和形成环境的工具。

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By rewinding the video of a zebrafish embryo, the researchers were able to trace the origin of cells that formed specific tissues, such as the retina at the back of the eye.

通过回放斑马鱼胚胎的录像，研究者可追寻出组成特定组织比如它眼球上的视网膜的原细胞。

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Often, you can trace the origin of a bug back to a caller that's sending the wrong type of argument, the wrong number of arguments, or a mismatch between the order of actual and formal arguments.

常常可以发现bug的原因是调用者发送了类型错误的参数或数量错误的参数，或者实际参数和形式参数的次序不匹配。

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An etymologist can trace the origin and development of a word, but who can identify the moment when absolutely took off?

CNN: The words you love to hate

New regulations likely to be proposed by the State Department next year may follow guidelines being drafted by the UN and the OECD, a rich-country club, that will advise companies on how best to trace the origin of their materials.

ECONOMIST: Congo's conflict minerals

The proposals to be brought forward would address the fact the police - who can already tell when, where and who made a mobile phone call or sent a text message - cannot always trace the origin of an email, a message sent via instant messaging or a phone call made over the internet.

BBC: 'Fresh proposals' planned over cyber-monitoring