用饱和蒸汽加热的，须增加鼓壁的厚度和重量。
Heated with saturated steam, to increase the drum wall thickness and weight.
在性能提升之外，iPad 2的厚度和重量的减小也不容小觑。
Besides the performance improvements, iPad 2's reduction in thickness and weight should not be underestimated.
厚度和重量与先前版本的不同使iPad 2手握起来更舒适。
The difference in thickness and weight from the earlier version makes the iPad 2_________________.
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