But most of the easy substitution has already been done .
但是绝大多数的简单替换已经被做过了。
The gentle art of substitution and improvisation
替换和即席创作的文雅艺术
This type of plan worked well for latin american debt in the 1980s , culminating with the substitution of brady bonds for existing debts .
这种方案在上世纪80年代治理拉美债务危机上收效良好，最终以布雷迪债券替换了已有债务。
Since most camera flashes emit ir along with their burst of visible light , the one substitution allowed the prototype to transmit and record infrared light .
由于大多数相机闪光灯在发出可见光同时就会发射出红外线，这一替换使得模型机能够发送并记录红外线。
Hksar blog 's author said substitution , deletion and the insertion of single letters appeared to be common patterns , which " may indicate a level of ' creation ' or ' creativity . ' "
