since the dawn of humen ingenuity 这句话中 the dawn of 在句子中充当什么成

human ingenuity was initially demonstrated in the elite'cunning tackling of dangerous and boring work

ingenuity,a sense of humor,and imagination are needed to adapt activities to individual needs,and
ingenuity,a sense of humor,and imagination are needed to adapt activities to individual needs,and good physical coordination is necessary to demonstrate or participate in recreational activities.4624
问 1—sense of humor,and imagination are needed to adapt activities to individual needs。幽默感和想象力被需要去适应个人需要的活动。我把are needed to do 当成一个结构翻译成：被需要做某事。
2—good physical coordination is necessary to demonstrate or participate in recreational activities.这里的be necessary to do sth 是个句型吧：表示必需做某事？

翻译：Every device of which human ingenuity is capable has been used to deny this right.