A2 [ I ] When a bird, insect, or aircraft flies, it moves through the air.（鸟、昆虫或飞机）飞，飞行
A1 [ I or T ] to travel by aircraft, or to go somewhere or cross something in an aircraft（乘飞机）飞行，航行；乘飞机去；乘飞机穿过
[ T ] to use a particular company to travel by aircraft搭乘（某公司航班）
C2 [ T ] to transport people or goods by aircraft空运（乘客或货物）
B2 [ I or T ] to control an aircraft驾驶（飞机）
Many kinds of birds fly south at the approach of winter.
We watched a flock of birds fly over the field.
We are currently flying at an altitude of 15,000 metres.
Concorde flew much higher than most planes.
A swarm of bees flew into the garden.
[ I ] to move or go quickly快速移动；疾行
The dog fairly flew out of the door to greet him.
The side door of the pub flew open and three men burst in.
She flew past the other runners on the final lap.
A police car went flying past in the opposite direction.
She would have flown into a rage if I had told her about the incident.
[ I or T ] to wave or move about in the air while being fixed at one end挥舞；飘扬；放飞
[ I ] mainly US If rumours, accusations, etc. fly, they are passed quickly from one person to another and cause excitement.（谣言、指责等）被兴奋地传播，疯传
B1 a small insect with two wings蝇；苍蝇
The lizard flicked out its tongue at a fly.
I swatted the fly with a rolled-up newspaper.
The horses swished their tails to get rid of the flies hovering around them.
The dead sheep was covered with swarms of flies.
The spider preys on small flies and other insects.
UK also flies the opening at the front of a pair of trousers（裤子的）前裆开口，拉锁盖，纽扣盖
a hook (= curved piece of wire) with coloured threads fastened to it, attached to the end of a fishing line to attract fish（作钓饵的）假蝇钓钩
UK also flysheet an extra sheet of canvas (= strong cloth) stretched over the outside of a tent to keep the rain out（帐篷外层防雨的）篷顶