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[美国小学英语教材6] 美国小学英语教材6:第236课 森林产品(1)
Perhaps you think of lumber as being the main use that is made of trees. This article will tell you of the many other gifts that the forests make to us.2019-10-31 编辑：Wendy
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[美国小学英语教材6] 美国小学英语教材6:第237课 森林产品(2)
The first step in the manufacture of turpentine and rosin is collecting the gum from the trees.shallow wound made by chipping. Once a week a chip was cut through the bark above the box, each chip be..2019-10-31 编辑：Wendy
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[美国小学英语教材6] 美国小学英语教材6:第238课 森林产品(3)
The Indians taught us to make and enjoy maple sugar. In northern Minnesota one tribe still continues this industry,2019-11-04 编辑：Wendy
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[美国小学英语教材6] 美国小学英语教材6:第239课 森林产品(4)
In making leather from raw hides, the tannin used is obtained from the wood and bark of hemlock and oak.2019-11-05 编辑：Wendy
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[美国小学英语教材6] 美国小学英语教材6:第240课 森林产品(5)
The kind of Christmas tree you think of depends upon where you live, for we use firs, spruces, cedars, even magnolia. On the Pacific Coast white fir is used;2019-11-06 编辑：Wendy
