one of the positions of the body used in yoga

The downward dog is a posture or "asana" used in yoga. 下犬式是瑜伽中使用的一种姿势或“体式”。

In this branch of yoga, each asana is joined to the next to create a flowing series of movements. 在瑜伽的这一分支中，每个体式都与下一个相结合，形成一系列流畅的动作。

the part of yoga that consists of holding the body in different positions

Asana (the physical practice) is only one part of yoga. 体式（身体练习）只是瑜伽的一部分。

Hatha yoga includes asana (physical postures), pranayama (breath control), and deep relaxation. 哈达瑜伽包括体式（身体姿势）、调息（呼吸控制）和深度放松。