常常聚集

Nourished by the hippo dung, the cabbages multiplied until many of the pools were completely covered with these floating plants. Over them ran quickly black crakes and other birds.

长嘴鹳好像天生长有一个能从蜗牛壳里叼吃蜗牛的嘴，他们聚集在水池里，常常以浸在水里的河马的背为平台捕食蜗牛。

Instead of clustering tightly in urban ethnic enclaves, they spread out into suburbia, where they were often isolated.

亚洲人不是紧密的聚集在市区的少数民族居住地，而是分布在郊区，这里他们常常是孤立的。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。