Well this increased pulmonary blood pressure makes it harder for the right side to pump blood into.

肺部血压升高让右侧心脏更难泵血进入肺部。

Well in response to low oxygen levels, or hypoxia, the pulmonary arterioles constrict, which raises the pulmonary blood pressure.

为应对低氧水平或缺氧，肺小动脉会收缩，这就容易引起肺高血压。