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In summary, the up and down quarks make up all the nuclei and electrons orbiting around nuclei form atoms. 总括来说,上夸克和下夸克组成原子核,而电子则围绕原子核而形成原子。
Have a glass of beer to rinse your dinner down. 喝杯啤酒把你吃的晚饭冲下去。
The machine must break down at this busy hour. 正忙的时候，机器偏偏又坏了。
The old man stared the uninvited guest up and down. 老人把不速之客上下打量了一番。
He let himself down slowly by means of a tope. 他借助一根绳子慢慢地下来了。
The deer was peppered with shot all down one side. 那只死鹿的半边身子都被子弹击中。
The maid did down the walls with a duster. 女佣用掸帚由上而下地刷除四壁上的尘垢。
Bind down the ropes around the load on the lorry. 把绕在卡车上货物外面的绳子扎紧。
He was not a man to sit down with affront. 他并不是一个可以忍受当众侮辱的人。
One of the fishing boats sank down astern of us. 有一艘渔船在我们后面沉没了。
He slicks his hair down with oil every day. 他每天搽油把头梳得光溜溜的。
The chair sagged down under the fat man's weight. 椅子经这胖人一坐便压弯了。
Our torpedo boats bore down on the enemy cruiser. 我方面鱼雷艇向敌巡洋舰冲去。
Let's clean down the board before we paint it. 让我们在上漆以前把这块板洗干净。
She cast her eyes down to avoid direct eye contact. 她垂下双目以避免对视。
The children walk down the street hand in hand. 孩子们手拉手地在街上散步。
The teacher asked the pupil to put his hand down. 老师叫这个小学生把手放下。
Please verify each item you have pricked down. 请把你已用小记号标出的每一个项目核对一下。
The liner ran down a fishing-boat during the dense fog. 班轮在浓雾中撞沉了一只渔船。
She sat down on a tuft of grass. 她坐在一小块草地上。