But certain things aren't detectable using conventional methods: black holes, for instance, or cold dark matter.
但是某些事物是不能用常规方法探测的，比如黑洞和暗物质。
It was raining. And dark. And cold. We showed up at a friend's house, and there she was. A tiny black puppy out in the rain.
当时正在下雨，天很暗，又很冷。我们去了朋友的家里，而她就在那里出现——一只在雨里的小黑狗。
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