20170504 长难句每日一句
今天是五四青年节
是我们年轻人共同的节日
忙碌了一天
推荐你阅读如下的文字
有问题，欢迎长按二维码直接分答提问
【昨日长难句】
Yet these creatures are members of the biotic community and, if its stability depends on its integrity, they are entitled to continuance.
但是这些生物是生物群落的成员，并且如果该群落的稳定性依赖其完整性，那么这些生物有权/应该继续生存。
【今日长难句】
When one of these noneconomic categories is threatened and, if we happen to love it, we invented excuses to give it economic importance.
（今日的长难句较为简单，不再语音解析，直接看文字吧）
【结构解析】
“and”连接“when” 引导时间状语从句与“if”引导的条件状语从句，句子主干为主谓宾结构，即：we/invented/ excuses…; “to give it economic importance” 为目的状语。
【词的处理】
noneconomic /'nɔn,i:kə'nɔmik/ adj. 无实用价值的；无经济价值的
category /ˈkætəɡəri/ n. (人或事物的)类别,种类
threaten / ˈθretn / vt. 扬言要；威胁；恐吓
happen to do 碰巧做某事
invent / inˈvent / vt.编造；揑造；虚构
excuse / ikˈskju:s / n. 藉口；理由
【参考译文】
When one of these noneconomic categories is threatened and, if we happen to love it, we invented excuses to give it economic importance.
当这些无经济价值的物种之一受到威胁时，并且如果我们正好喜欢它，我们就会编造理由来赋予其经济价值。
【明日长难句】
At the beginning of century songbirds were supposed to be disappearing. Scientists jumped to the rescue with some distinctly shaky evidence to the effect that insects would eat us up if birds failed to control them.