Not catching what you hear even if you know every single word?

Figure: many liaison and omit make it hard to catch the whole sentence

The above example motivates me to write the post. I guarantee that you know every word in the sentence. But most of you can not catch what you hear when the sentence is read as a whole. The magic basically lies in that, most of the syllables are shortcut connected (a.k.a, liaison) or even omitted.  This makes it difficult for you to separate the words from a "smoothed" sentence spoken. So it is important for you to understand the common rules in oral English that regulate these liaisons and omits. I would like to direct you to some external sites that talk about the issue in greater details：

 知乎：连读、略读、断句、语调...是时候了解一下正确的发音规律了，

新浪博客：英语连读规则+弱读+省略+音变，

搜狐：史上最全英语连读、略读发音规则，收藏起来慢慢练。