String是不可变的，但如果我们的工作需要字符串有很多变化，StringBuffer将是一个开销较低的选择。
String is immutable and if we are doing work that requires mutations, StringBuffer is a less costly alternative.
锯切速度曲线是不可变的，但进给速度曲线随进给机构杆长比的不同而变化。
The sawing speed curve is unchangeable, but the feed speed curve can be different with different length ratio of members of the feeding mechanism.
锯切速度曲线是不可变的，但进给速度曲线随进给机构杆长比的不同而变化。
The sawing speed curve is unchangeable, but the feed speed curve can be different with different length ratio of members of the feeding mechanism.
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