More complex technologies are harder to copy, so their diffusion has been slower.
更复杂的技术模仿起来难度大，传播速度就慢了下来。
The new note has additional security features such as a 3d security ribbon designed to make it easier to identify and harder to copy.
新版100美元增加了防伪特征，比如设计了3 D防伪色带，让人更容易辨认，同时增加了造假难度。
Substantial Changes Harder to copy.
实质性的改变才是真本事。
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