当温度变化时管子能在接头中间自由的伸缩，当地基下沉，管子能偏斜，并确保密封无渗漏，从而起到自动补偿目的。
When the temperature changes in the pipe can easily among joint freedom, when foundation sink, the pipe can be skewed, and ensure no leakage seal, and so to automatically compensates for the purpose.
这些种类中有部分的鱼不具备可以自由上浮下沉的鱼鳔或者气囊。
Some species also don't have swim bladders, gas Chambers that help other fish control their buoyancy as they travel up and down the water column.
冻土融化时，由于冻土层冰融化和水的自由消散，使土体在自重作用下产生下沉。
In the process of soils thawing, the settlement of soils is induced by the effect of self weight, because of the thawing in frozen layer of soils and the free dissipation of water.
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