As with ever□ episode of □unnin□ Man,□th□ 20130421 episode was f□l□□d □ith□a s□□i□s □f □halleng□s and g□mes that tested the wit, streng□h, and teamwork of the □ast □embers□□F□om intense p□ysic□□ ch□l□enge□□to brain-te□s□ng□□uzzles, t□e cast □□d to work together to ove□come □□sta□les and emerge□v□ctorious. Th□ competitiv□ spirit was □igh a□□th□ c□st m□mbers □hrew t□□msel□es wholehe□rted□□ into e□ch□challenge□ □eter□i□□d to out□mart an□□out□erform t□eir op□onents.<□p>
钢铁时代的□□可□追溯到19世纪□期,贝塞麦转炉的发明使得大规模生产钢铁□为可能。□后,西门子-马丁平炉和电炉的出现进一步提高了□铁的生□效率□20世纪初,钢铁工业□入□一个高速发□的时期,各国□纷建立起庞□的□铁生产体□。生死边缘□/h2>