Nobody but two girls was in the reading-room.
除了两个女孩外，阅览室里没有人。
Like most twins, the two girls look very much alike, but unlike most twins, Betty and Abby share parts of the same body.
像大多数双胞胎一样，这两个女孩看起来很像，但与大多数双胞胎不同的是，贝蒂和艾比共享同一个身体的某些部位。
Of course, learning does vary a lot between individual students, but research reliably shows that this variance is far greater within populations of boys or girls than between the two sexes.
当然，不同学生的学习能力差异很大，但研究确实表明这种差异在男孩或女孩群体中要比在两性群体中大得多。
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