1. A contrail is the visible vapor trail behind airplanes or rockets traveling at high altitudes. 这团痕迹可能是飞机或火箭飞上高空后留下的航迹云。
2. The tentacles of a box jellyfish trail behind it and can reach 15 feet (4.6 meters) in length. 一只盒子海蜇的触须牵引式的它能延伸到15英尺(4.6米)长度。
3. When emperor penguins glide through the water, tiny air bubbles trail behind. On land, they are much less graceful. 这是企鹅们滑入水中的一刻,身后带着一串长长的气泡。在陆地上,他们可远没有这么优雅。
4. He resembled a deer, that throws one ear back upon the trail behind, and one ear forward, to know what is ahead. 他就象一头鹿一样,一只耳朵撩到后面,另一只耳朵则向前伸着探寻着什么。
5. The tentacles of a box jellyfish (Chironex fleckeri) trail behind it and can reach 15 feet (4.6 meters) in length. 一只盒子海蜇的触须牵引式的它能延伸到15英尺(4.6米)长度。