。
Wood burns easily.
Literal
Wood [topic-は] burn-easy.
Minimal ~やすい construction. The bare noun 木 — meaning both 'tree' and 'wood' depending on context, since the same kanji covers both — combines with 燃えやすい for a maximally generic statement. The slightly more elevated alternative 木造家屋は燃えやすい puts the same idea in Sino-Japanese vocabulary.