Gear lubricants may congeal and channel in cold weather.
天气冷时齿轮润
油可能凝结而形成凹槽。
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However each side of these shellac discs could only play about 3 or 4 minutes of music, and record companies realized that if they wanted a longer playing record, they would need a tougher material, one that could handle smaller grooves.
而,这
虫胶光盘的每
面只能播放大约3或4分钟的音乐,唱片公司意识到,如果他们想要播放更长的时间,他们需要
更坚韧的材料,可以承受较小的凹槽。
However, if the cable broke — releasing its tension — springs behind the levers would force them outwards into grooves in the elevator rails, those rails were then forced against the shaft walls, quickly arresting any cars fall.
而,如果缆绳断裂——释放拉力——杠杆
面的弹簧就会迫使杠杆向外进入电梯轨道的凹槽,
这
轨道就会被压在井壁上,迅速阻止任何坠落的电梯轿厢。