Because it devotes so little energy to swimming, it only needs a meal once a month. 因为它游泳耗费的能量极少, 所以只需每个月吃1顿饭
What were only recently chimneys teeming with life have turned into cold, sterile mineral monuments. 火山口丰富的生物群现在 只剩下了寒冷贫瘠荒凉的遗址
Disturb it and it only retreats a little distance. 它受到惊动就会稍稍后撤
The dense shoals, on which so many depend gather only when water conditions are perfect. 只有在水况非常好的情况下 才会出现这样的鱼群聚集
Plankton, it seems, is not the only food for a whale shark. 浮游生物看来并不是鲸鲨的唯一食物
Those that fly or climb are not the only ones to get a share. 这些花也不是只给会飞的和会爬树的享用
The threat of winter frost is not the only reason for trees to shed leaves. 寒冬的威胁不是树木落叶的唯一原因
Within a matter of weeks the canopy has closed and only a few wheeling shafts of light penetrate the woodland. 再过几个星期,树冠层重新遮蔽天空, 透到地面的只有丝丝缕缕的阳光
There are only forty Amur leopards left in the wild 目前仅有40只左右的远东豹
The ducklings are only twenty four hours old. 小鸳鸯才24个小时大