Their skulls show they had no chewing muscles.
它们的头骨显示它们没有咀嚼肌。
What I mean is he'll stand with all his muscles pulled tight, to show his body off to best advantage.
我的意思是，他会绷紧肌肉站在那，借此使得自己身体以最佳效果呈现。
Studies in rats show that leg muscles only produce this molecule when they are actively being flexed (for example, when the animal is standing up and ambling about).
对老鼠的研究显示，腿上的肌肉只有在它们在剧烈收缩时才会生成这种分子。(例如，当动物站着和走来走去时)。
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