3亿1

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1.

Mr. Knecht said that 315 million years ago , this place was near the side of a steep hill where sediment piled up quickly.

耐克特先生说在 3 亿 1 千5百万年前，该地处于已做陡峭的山峰旁，积淀层很快就会堆积起来。

2.

About 315 million years ago, an insect landed on a muddy patch, sat for a while and flew off.

在大约 3 亿 1 千5 白万年前，一只昆虫落在一块泥片上，呆了会儿就飞走了。

3.

What would he say to entice the roughly 310 million professionals who still haven't signed up for the service?

对于还没有注册的 3 亿 1 千万专业人士，他会说些什么呢？