与橡木相比，其他木材的膨胀和收缩速度不同，所以用这些木材做的橡木船的修理会出现裂缝或漏水。
Other woods expand and contract at different rates than oak, so repairs to oak ships done with those woods split or leak.
木材在潮湿的时候就会膨胀，而干燥的时候会缩小，这取决于其中含有的氢氧基团，它可以吸收和释放水分。
Timber swells when it is damp and shrinks when it is dry because it contains groups of atoms called hydroxyl groups, which absorb and release water.
木材潮湿后往往会膨胀。
木材浸湿后会膨胀。
木材吸收大气中的潮气后会膨胀。
The timber expands as it absorbs moisture from the atmosphere.
镶嵌的部分尤为明显，珍珠不会受到湿度变化的影响，但镶嵌珍珠的木材会在高相对湿度下变软或膨胀。
The pearl is all but impervious to changes in humidity, but the wood into which the pearl is inlaid is soft and swells under conditions of high relative humidity.
木材随含水量变化发生膨胀或收缩，这种现象称为胀缩。
The swelling or shrinkage with changes in moisture content is known as movement.
所以木材仍保持其膨胀时的体积。
但是，木材在相对的湿度中木材还是会有一定的膨胀。
However, wood still expands or contracts as related to the relative humidity in the air.
因为一架钢琴主要是由木材制成的，木材受到温度和湿度影响会引起音板轻微的膨胀和收缩。
Because a piano is made primarily of wood, it's affected by changes in temperature and humidity which cause the soundboard to expand or contract slightly during these changes.
以及潮湿地区因木材纤维管膨胀所引起木材弯翘和裂缝现象。
And wet areas due to expansion caused by wood fiber tube warping and cracking phenomenon of wood.
热压干燥还可以改变木材的吸湿膨胀特性，降低木材的吸湿能力，有利于提高木材的尺寸稳定性。
The press-drying can improve the specimen hygroscopic efficiency, decrease its hygroscopicity and raise its dimensional stability.
热压干燥还可以改变木材的吸湿膨胀特性，降低木材的吸湿能力，有利于提高木材的尺寸稳定性。
The press-drying can improve the specimen hygroscopic efficiency, decrease its hygroscopicity and raise its dimensional stability.
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