upward arc的意思|示意

The heat exchanging surface is arched or is inclined upward at the middle part and consists of a plurality of heat exchanging pipes which are arc-shaped or inclined upward at the middle parts.

所述换热面为拱形或向中间上方倾斜的换热面，由多根弧 形或向中间上方倾斜的换热管组成。

Air heated by the arc moves upward because it is less dense than the cooler air around it, and it moves at a speed for which the buoyant force and the drag force are equal.

空气加热，电弧向上的动作，因为它是密度较低，较凉的空气靠近它，它的速度移动，其中有浮力和阻力都是平等的。

She spun around in circles, her chin tilted upward, her arms outspread in an arc, until she collapsed dizzy with laughter on the lawn.

她转着圈，昂着头，手臂伸展，直到晕乎乎地大笑着跌倒在草地上。