code: public Object[] evalExprList(Scope scope) {
  		if (exprArray.length == 0) {
  			return NULL_OBJECT_ARRAY;
  		}
  		
  		Object[] ret = new Object[exprArray.length];
  		for (int i=0; i<exprArray.length; i++) {
  			ret[i] = exprArray[i].eval(scope);
  		}
  		return ret;
  	}
docs: 对所有表达式求值，并返回所有表达式的值