Mechanically speaking, silk fibers are as tough as steel.
技术上讲，丝纤维的强韧度堪比钢铁。
Tough universal steel tool box that can fit most tractors.
这是一种牢固多功能的工具盒，可在大多数拖拉机上使用。
This is the reality, which is as cold and tough as iron and steel.
这是事实，就像钢铁一样寒冷而顽固。
Steel in this class is tough, ductile and easily machined.
这种钢强韧，延展性好，而且容易加工。
Steel in this class is tough, ductile and easily machined.
这种钢强韧，延展性好，而且容易加工。
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