... 亿分之几 partper hundred million 十亿分之…,十亿分之一 part per billion 百万分之几级 parts per million range ...
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parts per million range
百万分率范围
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Predictions for 2100 range from 600 parts per million to 1, 000 parts per million, levels similar to those 65 million to 71 million years ago.
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