这些投诉只是冰山一角；我们甚至还没有开始着手解决那些系统性的问题。

These complaints ___are ___the ___tip ___of ___the ___iceberg; there are systemic issues we haven't even begun to address.

丢失的资金只是冰山一角，暗示着组织内部存在更严重的财务不当行为。

The missing funds ___are ___the ___tip ___of ___the ___iceberg, hinting at much larger financial misconduct within the organization.

他在公开场合的爆发只是冰山一角；私底下，他的行为更令人担忧。

His public outburst ___was ___the ___tip ___of ___the ___iceberg; privately, his behavior was far more concerning.