生命的每一个阶段我们都会失去某些东西，我们在失去的过程中成长。
At every stage of life we sustain losses and grow in the process.
优势：其一，它能帮助建立和维持朋友和亲人间的情感纽带。其二，它能帮助父母记录他们子女成长的每一个重要阶段。
Strengths: : One, it helps create and maintain the emotional bonds with friends and relatives. Two, it helps parents keep record of every important stage of their children's development.
在每一个时期里面事物的状态、特征是不同的，生命周期论强调了成长的阶段性。
Inside each time the thing are different, the life cycle theory emphasized the growth gradualness .
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