行星状星云在数万年间逐渐衰老。
Planetary nebulae fade away gradually over tens of thousands of years.
交易的10%佣金往往在数万元之上，绝不可以小觑。
A 10% commission often means tens of thousands of dollars which is not something to be sneezed at.
太阳的火圈温度高达数千万度，在数万英里外向四周蔓延。
The ring of fire, heated to tens of millions of degrees, stretches out tens of thousands of miles.
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