当边界条件有间断时，在应用分离变量法过程中如何适当处理问题是值得注意的。
When boundary conditions exists jump discontinuity, how to treat by an appropriate way is important in process to make use of the separation of variable.
方程中的非线性项关于其变量可以具有奇性和间断性。
The nonlinear term in the equation may have singularity and discontinuity in its variables.
PAC可以连续显示肺动脉压及其他多种变量，如心排血量，也可以间断性显示肺动脉闭塞压或楔压。
The PAC allows continuous display of pulmonary artery pressure, and variables such as cardiac output and pulmonary artery occlusion pressure, or wedge pressure, can be intermittently obtained.
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