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51. | buccal armature |
| 口甲 |
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52. | strange fish |
| [口]怪人 |
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53. | fillet and groove joint |
| 企口接口 |
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54. | hypostomal bridge |
| 口后桥 |
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55. | ostium appendicis vermiformis |
| 阑尾口 |
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56. | be able to do it on one's head |
| [口]轻而易举 |
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57. | Much oBliged! |
| [口]谢谢! |
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58. | slag notch aperture |
| 渣口 |
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59. | mouth of blast furnace |
| 鼓风炉口 |
|
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60. | ostium atrioventriculare |
| 房室口 |
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