沿用

yányòng
  1. to continue to use (old methods)
  2. to apply as before
  3. according to usage

CEDICT

to continue to use (old methods)

Wiktionary

照舊使用。

重編國語辭典

Entry Composition

1 沿 yán
  1. along
  2. to follow (a line, tradition etc)
  3. to carry on
  4. to trim (a border with braid, tape etc)
  5. border
  6. edge
2 用 yòng
  1. to use; to make use of; to employ
  2. (coverb) with; using
  3. to need; to have to (usu. used in the negative or in questions)
  4. usefulness; utility
  5. (bound form) expense; outlay
  6. (courteous) to eat; to drink
  7. (literary) hence; therefore