1. Laser pulses melt the metal surfaces and activate nitrogen, inducing nitriding reaction in liquid phase. 激光的作用使得金属表面熔化和氮气激活，导致液相氮化反应；
2. As a general rule, the better, more flow-inducing interfaces are those with plentiful and sophisticated direct manipulation idioms. 作为一个通常的规则，一个更好的流式的界面应该包含大量复杂的直接操作方法。
3. Like apoptosis, senescence is a stress response, but instead of inducing cell death, it puts a permanent brake on cell proliferation. 与凋亡相似，衰老是一种应激反应，与诱导细胞死亡不同，它是细胞增殖的长期抑制机制。
