20170502 长难句每日一句
这些文字，游戏人生
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【昨日长难句】
In undeveloped social groups, we find very little formal teaching and training. These groups mainly rely for instilling needed dispositions into the young upon the same sort of association which keeps the adults loyal to their group.
在不完善的社会团体中，我们几乎找不到正式的教学和培训。为使年轻人具备他们所需的性情，这些组织主要依靠与他们同类的协会，这种协会使成年人忠于自己的团队
【今日长难句】
One basic weakness in a conservation system based wholly on economic motives is that most members of the land community have no economic value.
音频讲解（听不懂的，请务必多听几遍）
【结构解析】
1. 根据系统班讲过的知识，修饰成分包括：介词短语in a conservation system修饰one basic weakness; 非谓语动词(ved短语) based wholly on economic motives修饰system.
2. 句子主干：主+系+表语从句；即One basic weakness/ is/ that most members of the land community have no economic value. 其中that引导表语从句，从句主干为主谓宾结构，即：most members of the land community/ have/ no economic value.
【词的处理】
weakness n. 弱点；软弱；嗜好
conservation n. 保存，保持；保护
wholly adv. 完全地；全部；统统
motive n. 动机，目的；主题
community n. 社区；[生态] 群落
economic adj. 经济的，经济上的；
【参考译文】
One basic weakness in a conservation system based wholly on economic motives is that most members of the land community have no economic value.
在一个完全以经济目标为基础的(生态)保护系统中，一个根本弱点在于陆地群落的大多数成员没有经济价值。
【明日长难句】
Yet these creatures are members of the biotic community and, if its stability depends on its integrity, they are entitled to continuance.