1、昨日4小时,总计99小时。
2、【单词】 infer vt.推断;猜想,推理;暗示;意指 vi.作出推论 ( Men observe and infer in all sorts of ways.) confer vt.授予,颁与;比较,对照 vi.商议,磋商 (He conferred with Hill and the others in his office.) refer vi.提到;针对;关系到;请教 vt.归因于…;使求助于;送交;认为…起源于 vt.& vi.参考,查阅 (In his speech, he referred to a recent trip to Canada.)