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| 21. | When you bend your elbow,you contract the muscles of the arm. |
| 你屈肘时,手臂的肌肉收缩。 |
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| 22. | Prolactin causes milk to be produced and oxytocin causes muscle fibers that surround the alveoli to constrict, as well as the muscles of the uterus |
| 催乳素促使产奶，催产素使乳腺周围的肌肉纤维收缩，同时也会使子宫的肌肉收缩。 |
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| 23. | 它可以减轻肌肉损伤和关节炎的疼痛。 |
| DMSO has anti-inflammatory properties when applied to the skin. It can help ease the pain of muscle injuries and arthritis pain. |
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| 24. | When muscle tissue shortens, it also bunches up. |
| 肌肉在收缩的同时，也会聚成团。 |
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| 25. | isometric exercises are anaerobic. |
| 肌肉等长收缩锻炼是不需氧的。 |
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| 26. | a graphical record of electric currents associated with muscular contractions. |
| 和肌肉收缩有关的电流图形记录。 |
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| 27. | When you bend your elbow, the muscles of the arm contract. |
| 当你曲肘时，手臂的肌肉收缩。 |
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| 28. | To unbend the arm other muscles in the back of the arm have to shorten. |
| 要伸直手臂，背面的肌肉就得收缩。 |
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| 29. | The contraction of muscle is a reaction of the body. |
| 肌肉的收缩是人体的一种反应。 |
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| 30. | A muscle that counteracts the action of another muscle, the agonist. |
| 拮抗肌，对抗肌抵消肌肉作用的另一块肌肉，收缩肌 |
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