1997年上半年
the first half of the year 1997
1999年上半年
First Half of the Year 1999
2000年上半年
the First Half of the Year 2000
2002年上半年
the First Half of the Year 2002
20世纪上半期
the first half of 20th century
20世纪上半叶
First Half of the 20(superscript th) Century
First Half of the 20th Century
amenable上半格序广义逆半群
amenably ∨-semilattice-ordered generalized inverse
半解析半数值法
semi-analytical numerical method
半解析半数值方法
semi-analytical and semi-numerical method