青蛙的排泄和繁殖功能都通过泄殖腔完成。

The frog's waste elimination and reproduction functions are both carried out through its ___cloacal opening.

在脊椎动物胚胎中，泄殖腔结构会逐渐分化为泌尿和消化系统的不同部分。

In vertebrate embryos, the ___cloacal structure gradually differentiates into distinct parts of the urinary and digestive systems.