s-

名词 s-:

1. 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
   同义词：second, sec, s
2. 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, S, sulphur, atomic number 16
3. the cardinal compass point that is at 180 degrees
   同义词：south, due south, southward, S
4. a unit of conductance equal to the reciprocal of an ohm
   同义词：mho, siemens, reciprocal ohm, S
5. the 19th letter of the Roman alphabet
   同义词：S, letter s
6. (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, S