...kPa(5cmH2O)水平，而吸气继绝进行，如连气儿发生三次这种呼吸，压力上限会收回报警旌旗灯号，表示为"压力受限(limited pressure)"。如果达到实际压力上限，吸气将中断。
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“总体来说，工业受限于预想的目标，受产业明晰的标准的制约，而且不断受制于商业需要的压力，”他在1945年的报告中写道。
"Industry is generally inhibited by preconceived goals, by its own clearly defined standards, and by the constant pressure of commercial necessity," he wrote in 1945.
此项研究受限于参加了旅行的休假者和那些没有去旅行的休假者的不同，包括收入水平，压力和教育程度的不同。
The research controlled for differences among the vacationers and those who hadn’t taken a trip, including income level, stress and education.
所以，收入增加，生育受限，越来越多生活在小规模富足家族的人“想要儿子”，承担的压力也最大。
So, with rising incomes and falling fertility, more and more people live in the smaller, richer families that are under the most pressure to produce a son.
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