FIG. 9 illustrates a simple flat roof, consisting of timber bearers covered with timber boarding and finished with several layers of tar felt.
图9所示为一个简单的平屋顶它由木承梁组成并铺以木板，再铺几层油毡防水。
FIG. 9 illustrates a simple flat roof, consisting of timber bearers covered with timber boarding and finished with several layers of tar felt.
图9所示为一个简单的平屋顶它由木承梁组成并铺以木板，再铺几层油毡防水。
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