biyearly
sp. 每年两次的
近义词：semiannual，biannual，biennial，semiannually，biennially，half-yearly，
英英释义
Adjective
- occurring every second year;
"they met at biennial conventions"
- occurring or payable twice each year
Adverb
- every two years;
"this festival takes places biennially"
- twice a year