Who called out to the thieves in the dark?

谁在暗处对窃贼喊了一声？

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Listen to the tape then answer this question. Who called out to the thieves in the dark?

听录音，然后回答问题。谁在暗处对窃贼喊了一声？

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The findings surprised astronomers because most galaxies form in association with a mysterious substance called dark matter or out of gas containing metals.

这一发现使天文学家感到吃惊，因为大部分星系形成都和“暗物质”有关，或者由富含气体的金属物质组成。

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