自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
N-COUNT 螺栓 A bolt is a long metal object which screws into a nut and is used to fasten things together.
VERB 用螺栓固定；闩上 When you bolt one thing to another, you fasten them firmly together, using a bolt.
The safety belt is easy to fit as there's no need to bolt it to seat belt anchorage points...
Bolt the components together...
N-COUNT （门、窗的）金属插销，闩 A bolt on a door or window is a metal bar that you can slide across in order to fasten the door or window.
I heard the sound of a bolt being slowly and reluctantly slid open.
VERB 闩上（门、窗） When you bolt a door or window, you slide the bolt across to fasten it.
He reminded her that he would have to lock and bolt the kitchen door after her.
...the heavy bolted doors.
VERB （常指人或动物因受惊吓）迅速逃跑，逃窜 If a person or animal bolts, they suddenly start to run very fast, often because something has frightened them.
The pig rose squealing and bolted...
I made some excuse and bolted for the exit.
VERB 狼吞虎咽 If you bolt your food, you eat it so quickly that you hardly chew it or taste it.
Being under stress can cause you to miss meals, eat on the move, or bolt your food.
N-COUNT 一道（闪电） A bolt of lightning is a flash of lightning that is seen as a white line in the sky.
Suddenly a bolt of lightning crackled through the sky.
N-COUNT （布的）一匹，一卷 A bolt of cloth is a long wide piece of it that is wound into a roll round a piece of cardboard.
...bolts of black silk.
VERB （蔬菜）生长过快，结实过早（而不宜食用） When vegetables such as lettuces or onions bolt, they grow too quickly and produce flowers and seeds, and therefore become less good to eat.
If the soil dries out the plants may bolt.
PHRASE 突然逃跑；慌忙逃窜 If someone makes a bolt for somewhere, or makes a bolt for it, they make a sudden escape.
His father kept a tight grip on his collar in case he should make a bolt for the door.
PHRASE 晴天霹雳；出人意表；令人大吃一惊 If a piece of news comes like a bolt from the blue, it is completely unexpected and very surprising.
The company decided to appoint a Japanese manager as president of the company. The decision came as a bolt from the blue.
PHRASE 挺直地；笔直地 If someone is sitting or standing bolt upright, they are sitting or standing very straight.
When I pushed his door open, Trevor was sitting bolt upright in bed.