n.

1. 英語字母中第十九個字母，小寫為s

n.

1. the nineteenth letter of the alphabet.
2. denoting the next after R in a set of items, categories, etc.

abbrev.

1. (chiefly in Catholic use) Saint.
2. siemens.
3. small (as a clothes size).
4. South or Southern.
5. Sweden (international vehicle registration).

symb.

1. the chemical element sulphur.
2. Chemistry  entropy.