The front and back leg quadriceps contract, extending the knees and stretching thelowerregion of the hamstrings.
股四头肌前侧和后侧收缩,伸直膝盖、伸展腘旁肌下部。
2
Argon bubbles distribute unevenly and the gas holdup of liquid steel in the upper region is far higher than that of thelowerregion.
氩气的分布不均匀,上回流区钢液的含气率大大高于下回流区。
3
In contrast to the city lights along the sea coast and interior, the Atlantic Ocean appears as a featureless dark region filling thelower right quarter of the image.