后背宽而坚固。

The back is broad and firm.

youdao

观察到宽吻海豚可以跃出水面高达16英尺(4.9米)，用它们的后背部或侧面飞溅着陆。

Bottlenose dolphins have been observed to breach up to 16 feet (4.9 meters) out of the water, landing with a splash on their back or side.

youdao

你知道吗？观察到宽吻海豚可以跃出水面高达16英尺(4.9米)，用它们的后背部或侧面飞溅着陆。

Did you know? Bottlenose dolphins have been observed to breach up to 16 feet (4.9 meters) out of the water, landing with a splash on their back or side.

youdao

双脚与肩同宽，保持膝部稍弯，后背挺直，双眼注视前方。

Set your feet shoulder-width apart, and keep your knees slightly bent, back straight, and eyes focused straight ahead.

youdao

后背直、宽、水平、且肌肉发达。

The back is straight, broad, level, and muscular.

youdao

后背直、宽、水平、且肌肉发达。

The back is straight, broad, level, and muscular.

youdao