This accounts for our reaction to seemingly simple innovations like plastic garbage bags and suitcases on wheels that make life more convenient : " how come nobody thought of that before ? 这次说明我们的反应似乎是简单的创新像塑料的垃圾袋和带轱辘的箱子使得生活更便利： “为什么没有人在这之前想到？ ”
2.
This accounts for our reaction to seemingly simple innovations like plastic garbage bags and suitcases on wheels that make life more convenient : " how come nobody thought of that before ? 这就解释了我们对见到了一些对我们生活带来便利但是很简单得发明时的反应: "为什么之前没有人想到呢? " .诸如:塑料袋和带轮子的行李箱
3.
This accounts for our reaction to seemingly simple innovations like plastic garbage bags and suitcases on wheels that make life more convenient : " how come nobody thought of that before ? 这说明了我们对于看起来简单的类似能够使得我们生活更方便的塑料垃圾带和带滚轮的手提箱改革的反应： “在没有任何人想到那些东西以前，我们的生活会是什么样子呢？ ”
