每一边二公尺必须为净空的安全区域。
There will be a clear safety area of two metres on each side.
事实上，树獭每分钟只移动二到三公尺，这让牠们成为世界上最迟缓的动物。
In fact, sloths only move two to three meters per minute, which makes them the slowest mammals in the world.
这项设备1平方公尺的开口，每年即可从大气中抽取10吨二氧化碳。
A device with an opening of one square meter can extract about 10 tons of carbon dioxide from the atmosphere each year.
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