参考答案:
硬膜外腔:硬脊膜与椎管内面的骨膜之间的腔隙称为硬膜外腔,其内有脊神经根通行,临床上进行硬膜外阻滞时,就是将药物注入此腔内,以阻滞脊神经的传导作用。
A. longest
B. have ever taken
C. had flown
D. for
This is the (longest) flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for) 9 hours.
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