The semi-monthly changes of the mud fluid are controlled by the amount of fine sediments supply.
半月周期的变化受潮流半月周期变化引起的泥沙供给量的变化控制；
2
Get your colleagues to clean up and clear out the office on a monthly, quarterly or semi-annual basis.
让你的同事或每月或每季或每半年清理一次办公室。
3
The monthly mean sea surface temperature for many years are subjected to a harmonic analysis so as to determine the amplitude and phase of the annual and semi-annual temperature variations.