on the go: very active or busy eg：we cant keep small children still,they are always on the go. eat into: 1.gradual reduce the amount of sth 2.damage or destroy 3. to use up /eg:our holiday has eaten into the money we saved fraction: 1.small part / when the factory closed,the machinery was sold off for only a fraction of its true value. 2.part of the whole number //分数 fracture v.断裂，折断
