在这些高的地方很难呼吸。
It is difficult to breathe at these altitudes.
医生叫我吸气然後(再)慢慢地呼出。
The doctor told me to breathe in and then breathe out (again) slowly.
蚊子会吸我们的血。更糟的是,它会把毒注入我们的体内。
The mosquito will suck our blood. What's even worse, it will inject poison into our bodies.