@mskathleenquinn @greg_travis There is no question that border controls are expensive. But the are still places that never would really do for real it even when whole economies were shut down. It's almost an article of faith (that you hear repeated by all the "PH experts" every time) that they "don't work".
@mskathleenquinn @greg_travis 毫无疑问，边境管制的成本很高。但是，即使整个经济体都关闭了，这些地方也永远不会真正做到这一点。他们“不起作用”几乎是一种信念（你每次都听到所有“PH专家”重复）。