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41. | balance statement |
| 对称语句 |
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42. | external symmetry |
| 外对称 |
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43. | balancing bushing |
| 对称轴瓦 |
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44. | counter pattern |
| 对称花纹 |
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45. | CH2ClCH2Cl CH2ClCH2Cl; |
| 对称二氯乙烷 |
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46. | reverse symmetry |
| 反向对称 |
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47. | holohedral symmetry |
| 全对称 |
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48. | counter flooding |
| 对称注水 |
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49. | rotational symmetry |
| 轴向对称 |
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50. | two-fold symmetry |
| 双重对称 |
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