■ birth

涉及分别的多人时，可以用复数。

• (the study) has been following several thousand twins since their births in 1994 and 1995.（这次调查）追踪了几千名双胞胎，从他们 1994 与 1995 年出生时起（参见 life, death 条）。

• both
• bother
• bow and arrow
• bread
• break a leg
• breakfast
• bridge
• bring
• bring 与 take
• british
• broad
• broad 与 wide
• brush
• buffalo
• build
• build...into
• bull
• burned
• bus
• business
• busy
• but
• but
• but for
• buy