Under the action of a same heat source, when the direction of grain is perpendicular to the direction of the action, the ignition delay time is the longest.

同样外部热源作用下，木材内部木纹方向垂直于作用方向时，着火延迟时间最长；

youdao

CILSS, an intergovernmental body responsible for the region's food security, significant amounts of grain have this year been flowing in the opposite direction.

ECONOMIST: Economics focus