■ 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）。

• there is
• the right side of the tracks
• the side of the tracks
• the...side of the tracks
• the wrong side of the tracks
• they
• they say that
• thick-skinned
• -thing
• thing
• think
• this
• this
• this is
• this...that
• those
• threaten
• through
• thunder
• thus
• till
• time
• times
• tired from
• tired from 与 tired of