不同锻炼阶段参加闲暇体育锻炼的频度、时间和强度差别具有显著性；
There is significant different for exercise frequency, time and intensity at different stage.
逐渐增加时间、距离和强度。
密封带有良好的耐候性，且长时间不失去粘性和机械强度。
E. seal with good weather resistance, and long time not lose viscosity and mechanical strength.
可用不同的添加剂去控制水泥的密度、凝固时间、强度和流动性能。
Various additives are used to control density, setting time, strength and flow properties.
分析了水泥浆液中掺入水玻璃对水泥凝结时间和无侧限抗压强度的影响。
The paper analyzed the influence of cement-silicate on setting time and compressive strength.
运动强度和运动持续时间决定其运动负荷。
The exercise load was decided by the intensity and duration of exercise.
当你适应后，缓慢增加运动的强度和持续时间。
Slowly increase the intensity and duration of your exercise as you become more fit.
当你适应后，缓慢增加运动的强度和持续时间。
Slowly increase the intensity and duration of your exercise as you become more fit.
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