Hawking has ALS, or amyotrophic lateral sclerosis, which has confined him to a wheelchair and leaves him unable to speak without the help of a computerized voice synthesizer.
2
试验证明这种发生器对材料的表面局部硬化非常有效。
Experiment has shown that it has good effect on partial surface hardening.
3
材料存放在料仓内，最好硬化至少24小时，然后输送至压机，但是需通过每个压机后的匀化器旋转筛。
The material is stored inside the silos and preferably matures for at least24hours and then conveyed to the presses passing however through the homogenizer rotating screens located behind each press.
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