That part of a relative temporal or spatial expression which indicates the direction of the offset between the two place names, dates, or times involved in the expression.
相关时间或空间表达式的差距，规定了表达式中两个地点名称、日期或时间的偏移方向。
That part of a relative temporal or spatial expression which indicates the distance between the place or time denoted by it and the place or time referred to within it.
相关时间或空间表达式的差距，表示空间或时间上的距离或者其中引用的地点或时间。
One of the major challenges encountered in gene therapy is appropriate spatial and temporal control of the expression of the therapeutic gene.
基因治疗的一个主要问题是对治疗基因表达的空间和时间的控制。
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