Polyacetylenes
多炔
🗣️ 情景例句
You'll never guess what I heard.
你永远也猜不到我听说了什么。
I was just about to call you.
我正准备打电话给你。
In this way, we have learned all that we know of the laws of astronomy,
例如，用这种方法，我们完全掌握了天文学的规律。