All birds lay eggs with hard shells

All birds lay eggs with hard shells made mostly of calcium carbonate. It is a semipermeable membrane that allows air and moisture to pass through.

Results (Chinese) 1:

所有鸟类产卵用的大多是碳酸钙制成坚硬的外壳。它是一种半透膜，它允许空气和湿气通过。

Results (Chinese) 2:

所有的鸟类都产卵，用硬壳制成，大部分是碳酸钙。它是一种半渗透膜，允许空气和水分通过。

Results (Chinese) 3:

所有的鸟产卵时都有硬壳，壳主要由碳酸钙制成。它是一种半透膜，允许空气和水分通过。