第19句见：Day19
《哲学的故事》的第20句：序言中的第2段第7句。
Some ungentle reader will check us here by informing us that philosophy is as useless as chess, as obscure as ignorance, and as stagnant as content. "There is nothing so absurd," said Cicero, "but that it may be found in the books of the philosophers." Doubtless some philosophers have had all sorts of wisdom except common sense; and many a philosophic flight has been due to the elevating power of thin air. Let us resolve, on this voyage of ours, to put in only at the ports of light, to keep out of the muddy streams of metaphysics and the "many-sounding seas" of theological dispute. But is philosophy stagnant? Science seems always to advance, while philosophy seems always to lose ground. Yet this is only because philosophy accepts the hard and hazardous task of dealing with problems not yet open to the methods of science--problems like good and evil, beauty and ugliness, order and freedom, life and death; so soon as a field of inquiry yields knowledge susceptible of exact formulation it is called science. Every science begins as philosophy and ends as art; it arises in hypothesis and flows into achievement. Philosophy is a hypothetical interpretation of the unknown (as in ethics or political philosophy); it is the front trench in the siege of truth. Science is the captured territory; and behind it are those secure regions in which knowledge and art build our imperfect and marvelous world. Philosophy seems to stand still, perplexed; but only because she leaves the fruits of victory to her daughters the sciences, and herself passes on, divinely discontent, to the uncertain and unexplored.
浙江大学版本：但这是因为哲学接手的是一个充满艰难险阻的任务，要处理尚未如科学研究般有章可循的问题。譬如善与恶、美与丑、生与死、秩序与自由，等等；一旦某一领域的知识探索得以突破并以公式形式准确表述，该领域即被划入科学的行列。
解析
这句比较长，但结构很清晰。分号前面是讲的是哲学研究的问题不能用科学方法解决，分号后面的是哲学研究一旦出成果便归到科学方面。这句显示哲学的high level，是科学的前奏，是统领。
1、yet放句首：意思是仍然，语气比but 要轻很多。
2、so soon as=so long as 只要，更强调时间点
3、it的指代，就近原则，是指field
那是因为哲学承担了一项艰难和有风险的任务，来处理些目前无法用科学方法解决的问题。譬如善与恶、美与丑、秩序与自由、生与死；一旦某个研究领域开始产生可以能被精确表述的知识，那么这个领域就被认为是科学的。
词汇
1、hazardous: involving risk or danger : dangerous
It was a hazardous voyage.
These are hazardous chemicals that can cause death if inhaled.
Passive smoking can be hazardous to health. 被动吸烟会有害健康
2、susceptible: easily affected, influenced, or harmed by something
The virus can infect susceptible individuals.
— often + to
He is very susceptible to colds. [=he catches colds easily]
formal : capable of being affected by a specified action or process
— + of
a contract that is susceptible of modification [=a contract that can be modified]（文中是用这个意思，指允许）
