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3D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。
Hitachi executives say this "black box" design makes gear harder to copy, and also harder to understand, for instance during testing.
日立公司的人说，这种黑匣子式的设计难以仿冒，同时再测试的时候也难以理解。
Using the 'now it's green, now it's blue' technique that the butterflies have evolved, the scientists say we might be able to design money or credit cards that are much harder to copy.
科学家称，利用由蝴蝶而来的“蓝绿”技术，我们将会制造出难以伪造的货币或信用卡。
Biotech drugs provide something of a hedge against this coming calamity, for two reasons. First, they are much harder to copy, so generic equivalents (called "biosimilars") will be slow in coming.
而生物技术制药可以提供抵抗这一灾难的利器，其中原因有二：第一，这些技术非常难摹仿，所以被称为“生物相似药”的普通替代品很难进入市场；
Biotech drugs provide something of a hedge against this coming calamity, for two reasons. First, they are much harder to copy, so generic equivalents (called "biosimilars") will be slow in coming.
而生物技术制药可以提供抵抗这一灾难的利器，其中原因有二：第一，这些技术非常难摹仿，所以被称为“生物相似药”的普通替代品很难进入市场；
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