他的道歉起初看似真诚，但仔细一想，他的话听起来并不诚恳。

His apology seemed sincere at first, but upon reflection, his words ___rang ___hollow.

在经历了所有未兑现的承诺后，这位政客的新保证在疲惫的公众听来空洞无物。

After all the broken promises, the politician's new pledges ___ring ___hollow to the weary public.

考虑到我们刚刚收到的坏消息，她那些乐观的保证显得苍白无力。

Her cheerful reassurances ___rang ___hollow in light of the grim news we had just received.