That was this symbolic vector operator in which the components are the partial derivative operators.
这个是符号化的向量算子，其中它的分量是偏微分算子。
Del so, this guy usually pronounced as del, rather than as pointy triangle going downwards or something like that, it's a symbolic notation for an operator.
这个一般读作，而不读作倒三角，或者别的，它是一个算子的符号。
In most clinical symptoms of periodical occurred problems can be viewed as a double bound supplements symbolic enrichment, namely symptom is a negative operator limit supplements enrichment.
在大多数临床中周期性发生的症状问题可被看做是双重束缚补充物的象征性浓缩，即症状是由否定操作者所限制的补充物的浓缩。
In most clinical symptoms of periodical occurred problems can be viewed as a double bound supplements symbolic enrichment, namely symptom is a negative operator limit supplements enrichment.
在大多数临床中周期性发生的症状问题可被看做是双重束缚补充物的象征性浓缩，即症状是由否定操作者所限制的补充物的浓缩。
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