If the target is an attribute reference: the primary expression in the reference is evaluated.
如果目标是一个属性引用：引用中的主元表达式被求值。
Leave the JSF expression {param.empno} as the primary key value.
使用JSF表达式(param . empno)作为主关键字的值。
Primary Main courses include language, mathematics, social and natural experience, artistic expression, music and sports.
小学主要课程有语文、数学、社会和自然体验、艺术表达、音乐和体育。
The results are as follows: 1 the expression value of primary symptoms is 0.
评价结果表明，长江口海域初级症状分值均为0。
The results are as follows: 1 the expression value of primary symptoms is 0.
评价结果表明，长江口海域初级症状分值均为0。
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