问题描述：
一个英文谜语,
although i am hardhearted,i am helpful to man ,i do not live in see ,sky ,or sand .i drink with my feet .i do not ever sleep ,for if i lie down ,i will die so what am
\"如果,我是冷酷的,我是对人有用的,我不住在海里,天空或者陆地.我靠脚喝水.我从来不睡觉,如果我躺下,那么我就死掉了~我,是什么?\"
although i am hardhearted,i am helpful to man ,i do not live in see ,sky ,or sand .i drink with my feet .i do not ever sleep ,for if i lie down ,i will die so what am
\"如果,我是冷酷的,我是对人有用的,我不住在海里,天空或者陆地.我靠脚喝水.我从来不睡觉,如果我躺下,那么我就死掉了~我,是什么?\"
问题解答：
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