New words：

cough [kɔf]
n.咳嗽；咳嗽声；咳嗽病
v.咳嗽；（从喉咙或肺中）咳出

Sample Sentences：

The old lady had a bad cough.
The doctor has given me some medicine to take for my cough.

Cover your mouth when you cough.
She coughed blood again this morning.

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