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41. | cross over turn |
| 压步转弯 |
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42. | stepwise extension |
| 按步开拓 |
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43. | step-counting function |
| 计步函数 |
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44. | alternating tread staircase |
| 错步楼梯 |
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45. | shift changeover parade |
| 换班步操 |
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46. | assembly job step |
| 汇编作业步 |
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47. | contragradient variables |
| 逆步变量 |
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48. | ambulacral system |
| 步带系 |
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49. | n-stage decision |
| n步决策 |
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50. | sporting rifle cartridge |
| 运动步枪弹 |
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