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※ feel obliged to do sth 感觉有必要做某事
-- I feel obliged to say no to his demand（n.要求, 需要）
※ be obliged to do sth 被迫做某事
-- They were obliged to sell their car to pay their debts off.（debt n.债务）
-- The experts from London zoo began to hunt (v.) for a puma.
-- The hunt (n.) for the puma proved the difficult. （prove vt.证明, 证实）
search 搜寻某处为了寻找到某人或某物
-- The police were searching the forest for the missing boy.
※ run after 强调追赶, 追求
-- look, a dog is running after a cat
-- what are you run after in your life
※ seek = pursue v.追寻(理想)
※ chase v.追赶 （-- They are chasing a thief / They are running after a thief）
※ run after 强调追赶, 追求
-- look, a dog is running after a cat
-- what are you run after in your life
※ seek = pursue v.追寻(理想)
※ chase v.追赶 （-- They are chasing a thief / They are running after a thief）
