例句與造句

1. The mucous membranes of hagfishes have a primitive typhlosole in the form of permanent zigzag ridges.
2. The country bordering Sixtymile River forms part of the Yukon plateau, a highland worn into rounded hills and long zigzag ridges, but containing no well-defined and continuous mountain ranges.
3. It's difficult to find zigzag ridge in a sentence. 用zigzag ridge造句挺難的