一燧石铺成的窄道在这短斜坡上蜿蜒上升。
这个国家这一区的房子是用燧石建造的。
这堵墙是用燧石建成的。
剥落的燧石刀片只一方。
然而，幸亏古代人制造了石头工具，尤其是燧石。
Fortunately, however, ancient men made tools of stone, especially flint.
这样我们就能更好地理解燧石在高度流体状态时的变形情况。
Thus we can better understand the deformation of chert in a highly fluid form.
然而，幸运的是，远古人用石头制作了工具，特别是用燧石。
Fortunately, however, ancient men made tools of stone, especially flint.
然而，幸运的是，远古人用石头制作了工具，特别是用燧石。
Fortunately, however, ancient men made tools of stone, especially flint.
应用推荐