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| 21. | In the traditional societies of Africa, the onset of puberty marked the change from child to adult. |
| 在非洲的传统社会中，青春期一开始就标志着从孩子变成成年人了。 |
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| 22. | Block messages from Junk Mail and Adult content senders. |
| 阻止垃圾邮件或带有成人内容的邮件。 |
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| 23. | February 1997, my colleagues and 1 announced the arrival of Dolly the sheep, the first mammal cloned from |
| 1997年2月，我和我的同事们宣布了第一头从成体细胞克隆出的哺乳动物－－多利羊的出生。 |
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| 24. | "The birth of that animal showed us that it is possible to take cells from an adult and make go back |
| "多莉的诞生向我们表明，从成年动物中提取体细胞然后使其回到发育的初始阶段，重新开始发育是可能的。 |
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| 25. | A person cloned from an adult cell might have a higher risk of cancer or premature aging, but we wouldn't |
| 一个从成体细胞克隆出来的人得癌症或未老先衰的危险可能更高，不过我们要真正了解这一点可能还需若干年的时间。 |
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| 26. | , mice, cattle, goats and pigs have been cloned, Dolly-style, by transferring the nucleus of a cell from |
| 至今为止，科学家们已经陆续成功克隆了绵羊、老鼠、牛、山羊和猪，这些动物克隆的方式都和第一只克隆动物多利绵羊是相同的，即把成年动物细胞中（含有遗传物质）的细胞核植入去核的卵细胞中，（并使两者融合，融合体分裂发育成克隆动物。） |
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| 27. | Method:Iliac spongy bone specimens were obtained from twelve adult patients scheduled surgery. |
| 取成人的髂骨松质骨,采用胶原-胰蛋白酶消化法,获得松质骨中的成骨细胞,进行纯化和培养。 |
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| 28. | the mammary gland containing the outlets of the milk ducts through which young mammals obtain milk from |
| 乳头靠近乳腺中心的小的凸起物，含有乳导管的出口，幼小的哺乳动物从成年雌性身上由此吸取乳汁；乳头 |
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| 29. | typed letter with a request for the applicant to complete a brief fact sheet, seek a recommendation from |
| 邀请信是一封打印件，要求每个申请人先填写一份简要的个人细节表格，再请一位成年朋友或导师写一封推荐信。 |
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| 30. | The child imitates only part of the time andd requires a great deal of persistence andd help from the |
| 中度异常的模仿行为。孩子只能在部分时间里做到模仿，并且需要大人持续大量的帮助才能做到，或者仅在一定的时间延迟后，频繁地模仿。 |
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