1. My bicycle has a flat tire. I need to inflate my bike tire with an air pump.2. My bicycle has a flat tire. I need to pump air into my bike tire with a bicycle pump.3. I need to inflate my air mattress with an air pump for my guest.
 air pump bicycle pumpair pump = 可泛指任何打氣筒bicycle pump = 專指腳踏車輪胎的打氣筒