From this survey, one can estimate that fewer than one in five children have some contact with a hospital teacher—and that contact may be as little as two hours a day.
从这个调查中，我们可以估计不到五分之一的孩子和医院的老师有过接触——这种接触可能每天只有两个小时。
The rolling contact fatigue performance of ceramic balls with fine compact equal-axis grain and fewer glass phase exceeds that of those with slightness-needle grain and more glass phase.
细小致密的等轴状晶粒、玻璃相少的陶瓷球的滚动接触疲劳性能优于长针状晶粒、玻璃相多的陶瓷球。
Prof. Zhang holds that double involute gear with ladder-shaped teeth possesses the advantages of good technology, high bending strength, high contact strength and fewer teeth.
张光辉教授认为：分阶式双渐开线齿轮具有良好的工艺性能、弯曲强度和接触强度高、最少齿数小等优点。
Prof. Zhang holds that double involute gear with ladder-shaped teeth possesses the advantages of good technology, high bending strength, high contact strength and fewer teeth.
张光辉教授认为：分阶式双渐开线齿轮具有良好的工艺性能、弯曲强度和接触强度高、最少齿数小等优点。
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