键
mechanical key; keyboard key; chemical bond
Meanings
4 senses · 9 examplesnoun
mechanical key; cotter pin
technicalA standard mechanical component used to fix rotating parts like gears and shafts together. Usually made of steel.
Before installing the gear, you must first place the key into the keyway on the shaft.
The connecting key of this machine is worn out and needs to be replaced.
noun
metal bolt for locking a door
archaicAn archaic or literary term for a metal bar used to bolt a door.
(Classical text) Doors are not locked at night, and bolts are not needed.
This old door still uses an old-fashioned iron bolt.
noun
key; button
Refers to the individual buttons on keyboards of computers, typewriters, musical instruments (like pianos), or other control panels.
When typing, please press the keys on the keyboard gently.
The keys of this piano are made of ivory.
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Press the F1 key to open the help menu.
noun
bond; valence line
technicalA line in a chemical structural formula representing a covalent bond between atoms.
In the structural formula of water, H-O-H, a single bond connects the oxygen atom and the hydrogen atoms.
The bond energy of a carbon-carbon double bond is higher than that of a single bond.