- The layer of wood formed in a plant during a single year. Annual rings appear concentric when viewed in cross section.年轮：一年里树木长出的层。从截面上看年轮呈同心圆状
- buttress
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- buttresses
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- butyl alcohol
- butylate
- butylated
- butylated hydroxyanisole
- butylated hydroxytoluene
- butylates
- butylating
- butylene
- butylenes
- butyl nitrite
- butyl rubber
- butyls
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