马洛尼说，安慰剂组的周长减少是典型的安慰剂反应的反映。
Maloney says the reduction in the placebo group is a reflection of thetypical placebo response.
钻头规是种周长一定的环型物，它卡紧在钻头的周围，去检测和测量钻头是否磨损，即在钻井过程中是否减少了周长。
Bit gauges, rings of defined circumference, are slipped around drill bits to detect and measure wear, which reduces the circumference of the bit during drilling.
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