它们象无鱼可打的沙漠中被侵蚀的地方一般古老。

They were as old as erosions in a fishless desert.

youdao

如用户在实际运行过程中两者结合使用，可减少机械振打的频率，减轻对机械振打部位的受热面焊口的冲击。

If user combines the two in actual operating process, frequency of mechanical rapping can be reduced and the impact on heating surface welded junction of mechanical rapping position can be relieved.

youdao

大约可制三打的饼干。

Makes about three dozen cookies.

youdao