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keystone

['ki:stəun] n
prop.&figur. pierre angulaire
keystone ['ki:stəun] adj.
construct. clefd'une voûte; cle de voute
life.sc., environ. espèce clé
keystone
: 24 phrases in 10 subjects
Antennas and waveguides1
Communications6
Computers3
Construction7
Forestry1
General1
Geography1
Information technology1
Life sciences1
Superconductivity2

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