在一定距离以外，蚜虫通常不能或难以识别其寄主植物。
In general an aphid cannot or hardly identify its host at a distance.
也许在一定的距离之外，我是可爱的。
在村庄和火车站之间还有一定的距离。
There is a certain distance between the village and the railway station.
他先把那枚漂亮的闪闪发亮的戒指托在空中，隔着一定距离观赏它。
He held the beautiful gleaming ring up in the air, eyeing it from a distance.
镭在离它的原始母体一定距离上固定下来。
在健康教育方面，中国与发达国家不定期有一定的距离。
There is a certain gap between China and developed countries in health education.
在健康教育方面，中国与发达国家不定期有一定的距离。
There is a certain gap between China and developed countries in health education.
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