well kept
adjective uk/ˌwel ˈkept/ us/ˌwel ˈkept/
(TIDY)
干净整洁的;受到悉心照料的
clean, tidy, and cared for
[ before noun ] He was astonished to find nice streets and well-kept houses. 他看到漂亮的街道和整洁的房屋后感到很惊讶。
(HIDDEN)
[ mainly before noun ]（秘密）谨守的，严守的
A well-kept secret has not been told or shown to anyone.
The details of the new car were a well-kept secret. 新车的详细情况仍然是严守的秘密。