这种方法非常巧妙，但是也很复杂，很少有人能够充分地理解它并利用其强大的功能。
They are very sophisticated but also very complex, so few people have been able to understand them well enough to take advantage of their power.
然而，仅有很少的证据显示有改善肺功能的效果。
However, there is little evidence of an improvement in lung function.
首先，我们知道，很少在现实市场功能的理论预测。
First of all, we know that in reality markets rarely function as the theory predicts.
他补充道：“带有视频功能的单色屏幕是很少见的。”
"It is rare to have a single color screen with video capabilities," he adds.
他补充道：“带有视频功能的单色屏幕是很少见的。”
"It is rare to have a single color screen with video capabilities," he adds.
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