第25句
25. The mechanism by which brain cells store memories is not clearly understood.
大脑细胞储存记忆的机理并不为人明白。
好家伙，今天这个内容基本上是专业对口了~不过就……咳咳，专注，背句子~！
这也是一个by which引导的从句。
英语用从句往往就是为了强调这个句子里面最重要的内容，把它放在最核心的位置。
比如这里，要强调的是“机理、机制”，所以必须把The mechanism放在最前头。
否则如果按原句修改过来就是：
Brain cells store memories by a mechanism that is not clearly understood.
这个机制放后面其实属于中文的逻辑思维了。所以我们可能觉得“这样也还好”，但在英语里面看着就更像在说脑细胞怎么怎么样。
这种行文方式其实也有利于我们去听懂英语，毕竟我们大部分人的听力更倾向于能听懂开头和结尾，同时这也和“首因效应”和“近因效应”相吻合。
另外也和中文、英文的表达方式有关。英文喜欢用“总分结构”，一开始先把关键信息告诉大家，然后再慢慢解释里面的内容；中文则是喜欢先拿出案例、数据等内容，最后再进行总结。
咳咳，又说多了，没往记忆方面走往表达方式这块走了是吧。
回到句子结构，可以看到修改后，store memories 是通过“by”来连接mechanism，所以在做从句的时候也要把“by”放回去，才有了by which这个写法。
如果是The mechanism which，就需要另外再加个单词去连接，比如through、obtain之类的。那自然没有by那么简单明了~
这种从句真要去理解也挺麻烦，最好的方法还是不断多读正确的例子，就不容易错了。
那么词汇：
#mechanism 机制、机理。原本意思是机械装置，后面引申为运作方式、过程等。这个词在学习人体的各种奥秘的时候真的太常见了，而且还真往往和not clearly understood连在一起用……只能说，人体，很奇妙吧~？
哎？其他好像没什么了……好吧那么全句默写：
The mechanism by which brain cells store memories is not clearly understood.
以上~
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昨天没默写，今天补一下。
默写有点过于占时间了，现在1-15句基本上比较稳定了，要着重复习一下16~25这十句。
如前所说，如果对顺序的记忆不清晰，那么乱序就不会有效果，甚至频繁的乱序会反过来把记忆揉成一团。
所以，这几天先强化16-25顺序的记忆。1-15就只写个开头结尾或者核心结构吧。
1. Typical of the...pronghorn. 2. Of the millions...twenty-first centry. 3. Anthropologists have discovered...facial expressions. 4. Because of the irritating...largely discontinued. 5. In order to...useful or desirable. 6. The greater population there is...disposal of refuse. 7. It is more difficult to...than to...obscure one's meaning. 8. The difference between...slander is spoken. 9. With modern offices...less severe interiors. 10. The knee is the joint...lower leg. 11. Acids are chemical compounds...vegetable dyes red. 12. Billiy Holiday's reputation...emotional depth to her song. 13. Essentially, a theory is...of what is conceived to be reality. 14. Long before children...by making noises. 15. Thanks to modern irrigation...but cacti and sagebursh could live.
16-25这10句的内容应该包括（不按顺序）：
时间和校准、碧根果的生长、音叉敲击、人类学之所以为科学、找替罪羊、理论概率和观测频率的关系、物质遇冷收缩与密度的关系、大脑记忆机制未明、国家的主要食物依赖于……、真菌分解（这个差点想不起来）。
印象中完全记不起他们的排序，除了时间和校准大概率是16、17，音叉应该是19、20左右，最后一条应该是大脑记忆机制（也就是今天的这条）……对一下答案：
16、20、19、17、21、23、24、25、22、18
这么看来21-25排序还挺正确，最乱的是16~20。
那么现在通过这个排序重新来一遍：
16时间和日晷（校准）；17人类学；18真菌和分解；19音叉；20碧根果；21替罪羊；22国家主要食物；23理论和观测概率；24物质收缩；25大脑记忆机制
好的，默写一下
16. The development of timepieces spurred the search of more accurate sundials with which to regulate them.
17. Anthropology is a science in that Anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others.
18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and decomposes animal debris.
19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.
21. Eliminating problems by transferring the blame to others is often called scapegoating.
22. The chief foods eaten in any country depend largely on what grows best in its climate and soil.
23. Over a very large mumber of trials, the observed frequency of an event's occuring becomes equal to its theoretic probability.
24. Most substances contract when they freeze, so the density of the substance's solid is higher than the density of its liquid.
25. The mechanism by which brain cells store memories is not clearly understood.
勉强默下来了，比之前强。明天再复习几遍应该就更好一些了。
