美国科学60秒 SSS 2013-02-07
时间：2019-01-20 作者：英语课 分类：Scientific American(二)月
Adult ants communicate with pheromones, touch and even sound. Now researchers have discovered that developing ants called pupae have their own distinctive 1 calls, which identify their social status within the colony. This finding is in the journal Current Biology. Ants rasp and chirp 2 by scraping a spite on their waist against a ridged section of their abdomen 3, but developing larvae 4 are silent. So ants recognise them by chemical cues, size, shape and even squishiness. The teenage versions of ants, the pupae, have hard outer shells that lack pheromones. However, the pupae do have fully 5 formed sound organs. The researchers thus record the audio from the pupae and discover clicking noises. The pulses' frequency and intensity 6 are more like the adult worker's stridulations than the queen ant's sound. The pupae's snaps are brief because their cases keep them from moving much. Still the noise appears to work, when the researcher disturb the nest, the adult ants rescue noisy pupae before the silent larvae. For ants, as for people, it pays to be the squeaky wheal.
- She has a very distinctive way of walking.她走路的样子与别人很不相同。
- This bird has several distinctive features.这个鸟具有几种突出的特征。
- The birds chirp merrily at the top of tree.鸟儿在枝头欢快地啾啾鸣唱。
- The sparrows chirp outside the window every morning.麻雀每天清晨在窗外嘁嘁喳喳地叫。
- How to know to there is ascarid inside abdomen?怎样知道肚子里面有蛔虫？
- He was anxious about an off-and-on pain the abdomen.他因时隐时现的腹痛而焦虑。
- Larvae are parasitic on sheep.幼虫寄生在绵羊的身上。
- The larvae prey upon small aphids.这种幼虫以小蚜虫为食。
- The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
- They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。