The theories of enveloping are to build up the minimum external enveloping model of the mechanical parts, assessing the deviation of its shape.
包容理论就是建立构件最小外包容模型，评定其外形偏差的方法。
The main external factor of solder joints degradation or deviation from an expected normal condition is the time stress such as work and environment stresses.
焊点所承受的各种环境应力和工作应力的时间历程（时间应力）是其疲劳失效的直接外因。
Car door external water slot: without such defects as crack, peeling, colour deviation, and lifting, etc.
车门外水切：无开裂，起皮，色差，翘起等缺陷。
Car door external water slot: without such defects as crack, peeling, colour deviation, and lifting, etc.
车门外水切：无开裂，起皮，色差，翘起等缺陷。
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