I
verb
BAD : He was aiming a gun against me.
GOOD : He was aiming a gun at me.
BAD : These programmes are aimed to a very wide audience.
GOOD : These programmes are aimed at a very wide audience.
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aim sth at sb/sth : 'Each ball seemed to be aimed at my head.' 'This new dictionary is aimed at intermediate learners of English.'
II
noun
1
BAD : Her lifelong aim was to learn to fly.
GOOD : Her lifelong ambition was to learn to fly.
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See note at AMBITION 1 (↑ ambition )
2
BAD : I started to learn English with the aim to become a teacher.
GOOD : I started to learn English with the aim of becoming a teacher.
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with the aim of doing sth : 'I originally went out to the Far East with the aim of setting up my own import-export business.'
Compare: 'My aim is to become a teacher.'