「」「」。
The plural of 'louse' is 'lice.'
Literal
'Louse' [genitive-の] plural [topic-は] 'lice' is.
A textbook statement about English grammar, rendered in polite Japanese. Structurally unremarkable — [noun A]のBはCです, the standard 'A's B is C' possessive-equation frame. The interesting thing here is the metalinguistic topic: Japanese has no inherent plural marking on most nouns, so Japanese learners of English often explicitly study singular/plural pairs like the irregular louse/lice, mouse/mice. 複数形 is the Japanese linguistic term for 'plural form,' a Sino-Japanese compound that is itself a good example of how grammatical terminology in Japanese is built from kanji compounds.