下肢深静脉血栓形成的三大要素是______、______、______。广泛的深静脉血栓形成最严重的并发症是_____。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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