她每天都要服用阿司匹林预防血栓。

She takes ___aspirin daily to prevent ___blood ___clots.

护士注意到病人手臂上有血块。

The nurse noticed small ___clots in the patient's arm.

一群抗议者聚集在广场中央。

A ___crowd of protesters gathered in the center of the square.

医生警告说，长时间坐着不动可能会导致血液凝块。

The doctor warned that sitting for too long can cause blood to ___clot.