分流术前门静脉平均压力为34.6匣米水柱， 分流术后平均降压6.7厘米水柱。
The mean portal pressure before shunt was 34.6 cmH_2O, and the average postshunt decrement was 6.7cmH_2O.
由于排汽凸轮盘不正确的定时或排汽系统背压过大（背压不能超过300毫米水柱）而导致燃气通过扫气口倒流。
C. Blow-back through the scavenge air ports, owing to an incorrectly adjusted exhaust cam disc or large resistance in the exhaust system(back pressure not exceed 300 mm wc)
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