短语讲解：

1. There was a lot of debate as to what the oxygen content was 800 million or more years ago,” said Nigel Blamey of Brock University’s Department of Earth Sciences.

a lot of 诸多; 许多的
例句：He is a man with a lot of experience under his belt.
他是个阅历很深的人。

2. Now paleobiologists will have reason to go looking for rocks with” evidence of these first evolutionary steps,” he told the Canadian Broadcasting Corporation.

look for 寻找（某人或某物）
例句：I look for you everywhere continuously!
我一直在到处找你！

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