Lack of fire is the primary factor.

缺乏火灾是主要因素。

Primary factor of producing cracks is temperature stress.

其中温度应力是闸墩裂缝成因的最主要原因。

The size of the data quantity is the primary factor in the division.

数据量的大小是决定分割的主要因素。

The primary factor to influence transport cost is distance and competition.

影响运输成本的主要因素是距离和竞争。

Error is the primary factor that affects assembly and manufacturing veracity.

飞机的制造和装配误差是影响装配准确度的重要因素。