看不懂这句英文

题目

看不懂这句英文
the government should take the blame for this because it refuses to raise money for food by selling oil through the UN as the sanction rules allow.
because it refuses to raise money for food by selling oil through the UN as the sanction rules allow.因为拒绝为食物筹钱，经联合国制裁允许？？？？

答案

政府应该为这件事的过失负上责任,因为政府拒绝以通过在制裁条约允许范围内经由联合国销售石油的途径来为食品筹钱
其中“以...途径”是英文中的by,是指为食品筹钱的途径