1. A single gene will code for only one of the many molecules and cell proteins that are the building blocks of the brain.
    一个基因仅仅为构成大脑的众多分子和细胞蛋白中的一个指定遗传密码。

2. You'll find it easier, then, to keep from settling for the single piece of candy.
    那样，你就不会轻易满足于只吃一块糖了。

3. — Children in single-parent households — usually families with only a mother present — are much more likely to be overtaken by poverty than those who live with two parents, largely because of the loss of support from the fathers.
    ——单亲家庭——通常是只有母亲的家庭——的孩子，较之与双亲一起生活的孩子，更可能遭受贫穷，这主要是因为缺少父亲的经济支持。

4. Charles's eyes went to the single window of the room.
    查尔斯将目光投向屋里惟一的窗户。

5. Children were told that they could have a single treat, such as a piece of candy, right now.
    他们告诉孩子们可以马上吃到一样东西，比如一块糖。

6. "I feel miserable because I haven´t got any jewels, not a single stone, to wear.
    “我觉得痛苦，因为我没有任何珠宝首饰可戴，一个都没有。

7. One single tear flows from her left eye, across the cheek and down onto the pillow.
    一颗泪珠从她的左眼中渗出，滑过脸颊，落在枕上。

8. One apparent exception to the general trends is Japan, where single-parent households and unmarried mothers have remained relatively rare.
    对于这一总体趋势，日本明显是个例外，该国的单亲家庭和未婚妈妈一直相对较少。

9. On the ground before you is the pile it held — so much like the piles in the other bags, could they be emptied, that all might be combined and mixed in a single heap and the bags refilled without altering the content of any greatly.
    面前的地上则是袋中所装的那堆东西的--它与其他袋子中所倒出的一堆堆东西几乎一模一样，如果把它们混成一大堆，再重新装回各自的袋中，也不会有多大的不同。

10. Lady Godiva asked her husband to have mercy on the people, but her stony-hearted husband showed no pity.
    葛黛瓦夫人恳求丈夫给人们一些怜悯，但她的铁石心肠的丈夫毫不动心。