It's a constant struggle to try to keep them up to par.

要使他们达到标准是一场持久战。

《柯林斯英汉双解大词典》

Many countries struggle simply to build schools quickly enough to keep up with population growth.

许多国家努力奋斗，仅仅是为了尽快盖一批学校，足以赶上人口增长的步伐。

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Many countries struggle simply to build schools quickly enough to keep up with population growth.

许多国家努力奋斗，仅仅是为了尽快盖一批学校，足以赶上人口增长的步伐。

youdao