semiannual

adj.

每半年的，半年的；

Semiannual variations of geomagnetic activity
Note on the semiannual effect in the thermosphere
A semiannual Indian Ocean forced Kelvin wave observed in the Indonesian seas in May 1997
Annual and semiannual variations in the ionospheric F2-layer: II. Physical discussion
Mountains versus valleys: Semiannual variation of geomagnetic activity
Comment on 'The semiannual variation of great geomagnetic storms and the postshock Russell
Estimation of the Kelvin Wave Contribution to the Semiannual oscillation.
Semiannual surveillance is superior to annual surveillance for the detection of early hepatocellular carcinoma and patient survival.
Semiannual and annual surveillance of cirrhotic patients for hepatocellular carcinoma: effects on cancer stage and patient survival ...
Electromagnetic properties of the neutrino and possible semiannual variations of the solar neutrino flux