Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.
骨头看起来是脆硬的，但它也有一定的弹性，使得骨骼能够承受相当的打击.
Although (it is) native to Europe, the daisy has now spread throughout most of North America.
虽然菊原产于欧洲，现在已经传遍了整个北美.
状语从句省略条件：
1.有特定的状语从句引导词，如when, while,if,as,although,even though,though.
2.从句为主系表结构。
3.从句主语必须与主句主语一致。
省略方式：同时省略“主+系”
B
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