The alphabet, like the height line in P. e. class, seemed invincible.

字母表就像体育课里面的极度界限，似乎不可征服。

youdao

The vessels, HMS Queen Elizabeth and HMS Prince of Wales, will be the largest ships ever built for the Royal Navy, nearly three times the size of the current Invincible-class carriers.

BBC: Third strike by shipyard workers

The Invincible Class ships - Illustrious, Invincible, and Ark Royal - will be replaced by larger Queen Elizabeth aircraft carriers which will enter service in 2017, the MoD said.

BBC: HMS Illustrious