这些问题只是冰山一角。

These issues ___are just ___the ___tip ___of ___the ___iceberg.

那次失败对公司来说仅仅是冰山一角。

That failure ___was ___the ___tip ___of ___the ___iceberg for the company.

最初的入侵只是冰山一角；安全漏洞的全部程度令人震惊。

The initial breach ___is only ___the ___tip ___of ___the ___iceberg; the full extent of the security failure is staggering.