Although man has known about asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent.
虽然人知道关于许多上百的石棉年，它在北美洲大陆第一次被开采的它不是直到160年前那。
Although man has known about asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent.
虽然人知道关于许多上百的石棉年，它在北美洲大陆第一次被开采的它不是直到160年前那。
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