This exercise greatly works the pectoral muscles and triceps.

这项运动能极大地锻炼胸和肱。

Next, the cancer can invade nearby tissues like the pectoral muscles below and the skin above.

其次，癌症可以侵袭附近组织，如其下的胸和其的皮肤。

They lie on top of the ribs and the pectoral muscles, and they're divided into three main parts.

他们位于肋骨和胸的前方，可以被分为分。

The breast becomes immobile and fixed, or stuck onto the chest wall due to infiltration if cancer cells spread into the pectoral muscles.

如果癌症累及胸，乳房会变得难以推动，粘于胸壁。

To flap their wings at this speed, hummingbirds have evolved giant pectoral muscles that comprise over a third of some species' bodyweight.

为了以这种速度拍打翅膀，蜂鸟进化出了巨大的胸，其占某些物种体重的分之一以。