is actually coloured white with sulphuric acid. 竟然被硫酸染成了白色
They can actually sense each bat flying past. 它们实际上能感觉到 每一只飞过的蝙蝠
but they could never have known that these flooded passageways were actually the beginning of subterranean rivers, 但他们从不知道这些水下通道 其实是地下河的入口
it was actually formed under water. 它实际上却是在水下形成的