This change is natural and normal, experts say.

专家们说这一变化是自然而且正常的。

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But in normal temperature this change needs huge current pulse generator which cost is expensive.

但在常温下使基体组织发生变化需要庞大的脉冲发生器组，成本造价高。

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For most people, they need to change jobs sometimes, it is normal.

对于大部分人来说，他们有时候需要换工作，这是正常的。

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For most people, they need to change jobs sometimes, it is normal.

对于大部分人来说，他们有时候需要换工作，这是正常的。

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