他们的腰的增大速度比控制组快了六倍。
Their waists grew six times as quickly as the control group's.
灰层增大速度大，灰中含残炭量不稳定。
Ash layers increase speed big, ash contains carbon residue quantity is not stable.
滑行的关键是在稳稳当当地行使在道路笔直部分前尽可能增大速度。
The key to coasting is to build up as much speed as you can before cruising on the straight parts of the road.
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