zero insertion

基本解释

If this argument is zero, the insertion mark will be placed before the item.
如果此参数是零，则将插入标记放置在指定项之前。
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Zero places the insertion point immediately to the left of the first character.
将插入点设为零时，插入点会立即移至第一个字元的左边。
Phase shift brought by natural binary refraction does not exist in the modulator, there is no zero-field leakage, temperature stability is very good, and insertion loss is small.
这种调制器的优点是不存在自然双折射引起的相位延迟，没有“零场泄漏”，温度稳定性好，插入损耗小等。