相片: image, photograph...
人类: humanity, human race, mankind...
序幕: prologue...
上述: aforementioned, above-mentioned...
迟疑: to hesitate...
每逢: every time, on each occasion, whenever...
层: layer, stratum, laminated, floor (of a building), storey, classifier for layers, repeated, sheaf (math.)...
畜牧: to raise animals...
不言而喻: it goes without saying, it is self-evident...
煤炭: coal...
