The disadvantage of Spark compared to a standard EBNF-based tool is that it is more verbose and that it lacks direct occurrence quantifiers (i.e., existential "+", possible "*", limited "?").

Spark与标准的基于 EBNF的工具相比缺点在于，它比较冗长，而且缺少直接的出现计量符（即表示存在的“+”，表示可能性的“*”和表示有限制性的“?”）

youdao

The disadvantage of Spark compared to a standard EBNF-based tool is that it is more verbose and that it lacks direct occurrence quantifiers (i.e., existential "+", possible "*", limited "?").

Spark与标准的基于 EBNF的工具相比缺点在于，它比较冗长，而且缺少直接的出现计量符（即表示存在的“+”，表示可能性的“*”和表示有限制性的“?”）

youdao