head arch的意思|示意

Above your head the best way to catch a ball above your head is by joining the thumbs and forefingers of your hands together so there is a small arch between your hands.

过顶球处理过顶球的最佳方法是用大拇指和其他手指一起来接球，因为那样双手之间可形成一个拱形。

For high arch DAMS in valleys with the characteristics of high water head, large discharge and large power, the problems of energy dissipation and scour prevention are serious.

高拱坝泄洪消能的特点是坝高落差大，流量大，功率大，位于河谷狭窄地区，泄洪消能与防冲问题突出。

To arch the neck and stimulate the cervical spine, lengthen the neck, drop the head back, lift the chin, and open the throat;

弯曲颈部并刺激颈椎， 拉伸颈部， 头向后仰， 抬高下巴， 打开喉咙；

Dip your head under the low arch.

在低矮的门拱下要低头。

Ma Wei head down child to go to the jade arch.

马威低着头儿往玉石牌楼走。

Once your arms are over your head, be sure to streamline and arch your body so that your hands hit the water first.

当胳膊在头顶部时，一定要保证你的身体的流线型和后仰的弓形，这样才能保证你的手先入水。