The biggest upgrades from the original Robonaut are R2's thumb, which now have four degrees of freedom (as opposed to three), and its overall speed, which have improved by a factor of four.
相比原始的机器宇航员，R 2最大的升级是拇指和整体速度；现在的拇指具有四个自由度(之前只有三个)，同时速度通过四个因素进行了提升。
Cutter is the key factor that affects TBM′s boring speed.
TBM刀具是关系TBM掘进速率的基本要素。
Cutter is the key factor that affects TBM′s boring speed.
TBM刀具是关系TBM掘进速率的基本要素。
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