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| 51. | Two from four leaves two. |
| 四减二剩下二。 |
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| 52. | dibromodiphenyl ether |
| 二溴二苯醚 |
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| 53. | dibutyltin diacetate |
| 二乙酸二丁基锡 |
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| 54. | Two plus two is four. |
| 二加二等于四 |
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| 55. | dichloro-dipropyl ether |
| 二氯二丙醚 |
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| 56. | diphenyl silanediol |
| 二苯基硅二醇 |
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| 57. | diethyl diphenyl urea |
| 二乙基·二苯基脲 |
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| 58. | ethyl diselenide |
| 二乙化二硒 |
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| 59. | difurfuryl disulbide |
| 二糠基二硫 |
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| 60. | TWO AND TWO MAKE FIVE |
| 二加二等于五。 |
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