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41. | previous arrangement system |
| 预先排列系统 |
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42. | pre-prepared material |
| 预先编纂的教材;预先备妥的教材 |
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43. | To notify in advance;forewarn. |
| 预先通知;预先警告 |
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44. | pre-authorized payment |
| 预先授权付款 |
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45. | have a prior engagement |
| 预先有约会 |
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46. | pretreatment basin |
| 预先处理池 |
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47. | advance locking |
| 预先锁闭 |
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48. | pre-assembly method |
| 预先装配安装法 |
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49. | forward purchasing |
| 预先购买;预购 |
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50. | preliminary mentor |
| 预先蒙导 |
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