S

名词 s:

1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

同义词：second, sec

an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)

同义词：sulfur, sulphur, atomic number 16

the cardinal compass point that is at 180 degrees

同义词：south, due south, southward

a unit of conductance equal to the reciprocal of an ohm

同义词：mho, siemens, reciprocal ohm

the 19th letter of the Roman alphabet

同义词：letter s

(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work

同义词：randomness, entropy