Tension headaches tend to feel like a pressure or tightness around the head.
患了紧张性头痛，感觉像脑袋周围无法放松，有一圈压力压着似的。
Seating load and tightness is dependent on back pressure.
阀座密封负载和紧密性与反压力相关。
Seating load and resultant tightness is dependent upon back pressure.
阀座密封负载和组合的紧密性是与返回压力密切相关。
Seat tightness achieved with torque as opposed to line pressure.
利用扭矩而不是管路压力来实现阀座的密封。
Seat tightness achieved with torque as opposed to line pressure.
利用扭矩而不是管路压力来实现阀座的密封。
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