tōng​xīn

hollow, tubular

通心 tōng​xīn
hollow, tubular noun
(bound form) hollow or tubular, referring to the center of a cylinder or object
sensible
(literary) to be understanding or sensible, specifically having a clear mind and understanding the principles of things

Frequency

Written text
0.222 per million

Sources

Frequency data
BCC Corpus (BLCU)