So the land in Canada and the northern Great Lakes is slowly rising, while the rest of North America is slowly sinking, like a seesaw, enabling the mantle to flow back north.
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Prices have gone up and down like a seesaw this year.
今年的价格像跷跷板一样时涨时跌。
Think of it like a seesaw — neither side is touching the ground because the weight on each side is identical.
把它想象成一个跷跷板——任何一边都不会碰到地面，因为两边重量是相等的。
Under the prevailing Keynesian view of economy, unemployment and inflation are like kids on a seesaw: when one goes up, the other goes down.
在经典凯恩斯理论下，失业率和通货膨胀应该像是跷跷板上的两个孩子，一个上去，一个就下来。
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