但这些治疗都不太有效，而且成功与否因人而异，作者说。
But these therapies are only modestly effective, and success varies widely, the authors said.
一些其他的技术不太有效，但仍设法向读者传达重要的概念。
Some other techniques proved to be less effective, but still managed to convey the important concepts to the reader.
虽然银行会试图向网上结算征收费用，但这一招数过去就不太有效。
Banks could try to charge customers for settling such bills online; however in the past such schemes have failed.
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