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Eggshells are fragile.
Literal
Egg [possessive-の] shell [topic-は] break-easy.
壊れる is intransitive 'to break / become broken' — 壊れやすい = 'breaks easily / fragile.' The ~やすい suffix attaches to a verb's masu-stem to form an i-adjective meaning 'prone to X-ing.' A perfect everyday example of fragility.