然而关于利胆剂有效性比较资料很少。
However, there are few comparative data on the effectiveness of choleretic agents available.
这个数字听起来并不多，但你将这个数字和一辆每加仑3.3英里的代表性的柴油公交车的有效性比较相比就多了。
That doesn’t sound like much, until you compare it to the efficiency of a typical diesel bus which is 3.3 mpg.
这个数字听起来并不多，但你将这个数字和一辆每加仑3.3英里的代表性的柴油公交车的有效性比较相比就多了。
That doesn't sound like much, until you compare it to the efficiency of a typical diesel bus which is 3.3 MPG.
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