upper bow的意思|示意

Sound: play open strings alone; play slow scales, sustaining a 20- to 30-second bow; practice everything in the lower or upper half; or watch your contact point in the mirror.

音色︰只用空弦拉奏；慢慢地拉奏音阶，一弓维持在 20-30 秒；所有以上半弓或下半弓练习；或对着镜子看（弓的）接触点。

A similar process occurs on a much smaller scale to gas surrounding a single star, forming the bow-shaped arc seen near the upper left side of the Cone.

类似的过程以小得多的规模发生在锥状星云左上方的一个恒星周围，形成了一个弧形光晕。

Check this part for accuracy. It should have the dimensions as shown below. Unlike the upper support bow, the height of the lower bow must be maintain along with proper symmetry and width.

请在此精度的一部分。它应该有如下的尺寸为鞠躬。有别于上的支持，船首高度较低，必须保持适当的对称性和沿宽度。