a screw
可数名词，指单个螺丝时前面通常用不定冠词 a 或 an。
She tightened a screw on the chair leg with a screwdriver.
她用螺丝刀拧紧了椅腿上的一颗螺丝。
拧；转动；扭转；螺旋桨；狱警；监狱看守；倒旋；下旋；螺旋；螺旋位移
a screw; a spiral-threaded device or simple machine
具有螺旋功能的装置。
A device that has a helical function.
狱警
someone who guards prisoners
拧东西的动作；向一侧的转动或扭动。
The motion of screwing something; a turn or twist to one side.
螺旋(一种简单机械,由螺纹圆柱杆和匹配螺纹孔组成)
a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
反旋转。
Backspin.
螺旋桨(由多个倾斜叶片组成,旋转时推动水或空气)
a propeller with several angled blades that rotates to push against water or air
空间中的一条直线,与之相关联的是一个称为螺距的确定线性量。用于表示刚体的位移,总是可以由绕轴旋转与平行于该轴的平移组合而成。
A straight line in space with which a definite linear magnitude termed the pitch is associated. It is used to express the displacement of a rigid body, which may always be made to consist of a rotation about an axis combined with a translation parallel to that axis.
一种端足类甲壳动物。
An amphipod crustacean.
I bought a longer screw for the shelf because the original one was too short.
我买了一个更长的螺丝来装架子，因为原来的那个太短了。
用法提示：此处 screw 是名词，指“螺丝”，是装架子用的紧固件。
The handle stays loose because two screws are missing from the drawer.
抽屉的拉手一直松动，因为抽屉少了两个螺丝。
用法提示：此句中 screws 是名词复数，意为“螺丝”。
She found a small screw on the floor and put it back in the toy.
她在地上找到一颗小螺丝，又把它装回玩具里。
用法提示：此处 screw 是名词单数，指“螺丝”，与后面的 it 对应。
可数名词，指单个螺丝时前面通常用不定冠词 a 或 an。
She tightened a screw on the chair leg with a screwdriver.
她用螺丝刀拧紧了椅腿上的一颗螺丝。
复数形式表示多个螺丝，表示数量时可直接在 screws 前加数词。
The metal plate is fastened with four screws.
这块金属板用四颗螺丝固定。
英式英语口语中，the screws 特指狱警，通常带定冠词 the。
The screws locked the prisoners in their cells every night.
狱警每天晚上把囚犯锁在牢房里。
grammar · medium
易错句子Please give me a screw to open the bottle.
正确表达Please give me a screwdriver to open the bottle.
汉语里“螺丝”和“螺丝刀”都含“螺丝”，学习者常把工具 screwdriver 说成 screw。screw 指螺丝本身，用来拧螺丝的工具是 screwdriver。
grammar · medium
易错句子I need screw to fix this chair.
正确表达I need a screw to fix this chair.
screw 是可数名词，单数形式前必须加 a/an；汉语名词既不标复数也不强制加冠词，因此容易漏掉 a。表示“一颗螺丝”要说 a screw。
grammar · medium
易错句子Turn on the screw to tighten the shelf.
正确表达Turn the screw to tighten the shelf.
turn on 是“打开（电器）”的短语动词，不能表示“拧、转动”。表示转动螺丝只用 turn（或 tighten），此处应说 turn the screw，on 是多余的。
拧紧螺丝
He used a screwdriver to tighten a screw on the hinge.
他用螺丝刀拧紧了铰链上的一颗螺丝。
拧松螺丝
You need to loosen a screw before you can remove the bracket.
你需要先拧松一颗螺丝，才能拆下支架。
木螺丝
A wood screw is designed to grip into timber.
木螺丝是用来咬入木材的。
机械螺钉
The machine screw fits into a pre-threaded metal hole.
机械螺钉可拧入预先攻好螺纹的金属孔中。
螺纹
The screw thread on this bolt is worn out.
这个螺栓上的螺纹已经磨损了。
Choose the next layer that will help you use screw with more confidence.
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螺丝头
The screw head sticks out above the surface.
螺丝头凸出在表面之上。