36. unprecedented adj.空前的，史无前例的
e.g.the society is changing at a speed which is quite unprecedented.
37. inexorable adj. 不可阻挡的；坚持不懈的；无情的
e.g.Facts are inexorable || the inexorable march of science
38. Science is on the march. || the march of science/events/time
39. make great effort 努力； make every effort 尽一切努力；
overcome a myriad of political impediments克服政治障碍
40. a myriad of 无数，数不清
e.g.Each galaxy contains a myriad of stars.
