逐步

• Because of this, the characteristics of the species gradually change .
  正因为如此，物种的特征逐步演变。
• This may appear complex, so we shall explain it step by step .
  它似乎很复杂，因此我们将逐步地加以说明。
• Financial aid generally tapers off after the first year of college .
  助学金在大学一年级以后就逐步减少。
• A conventional skirmish would escalate into a nuclear exchange .
  传统的小规模战斗更有可能逐步升级为核战争。
• The developing-country bloc has coalesced in stages since 1964 .
  1964年以来，发展中国家集团已经逐步联合起来。
• We progressively divide this population into classes and sub-classes .
  我们将这些人口逐步划分为阶层和次阶层。
• Escalation is thus an aspect of deterrence and of crisis management .
  因此逐步升级是威慑和危机处理的一个方面。
• The initial discount would have to be phased out over the ten-year period .
  初期的折扣将不得不在十年中逐步取消。
• A stepwise nucleophilic displacement involving 36 was highly unlikely .
  涉及（36）的这种逐步亲核取代是不大可能的。
• The notion of achieving change gradually runs deep in eastern culture .
  逐步实行改革的概念已深深地在东方文化中扎根。