这种纸是由树木制成的。
纸是由树木制成的。
事实是，克雷蒙小提琴由生长在小冰河时期的树木制成，当时整个欧洲的气温明显低于正常水平。
Turns out the Cremonese violins were made from trees that grew during a Little Ice Age, a period when temperatures across Europe were significantly lower than normal.
木板外墙是由杨树木制成。
木板外墙是由杨树木制成。
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