or so persistent
或者如此执着
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Older children and adults who have whooping cough often appear to have a bad cold or persistent cough that can be so severe that it causes vomiting.
CNN: Can breast-feeding prevent whooping cough?
For instance, cholesterol drugs are so good at preventing second heart attacks that giving them to people who have had heart attacks or persistent chest pain might save money.
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