Take ( guilt responsibility etc ) upon oneself He worries that the world 's largest economic power is not living up to its responsibilities .

承担（罪责、责任等）他担心这个世界上最大的经济大国不能承担起 自己的责任。

It 's not in human nature to take unnecessary burdens upon oneself so one 's body soon becomes disaccustomed .

身体很容易不习惯 承受额外的负荷，人 天性如此。