向前

China has been developing at a high speed in the past 20 years.

在过去的20年中，中国一直高速向前发展。

In the past 20 years,China was keeping developing at a high speed.

在过去的20年中，中国一直高速向前发展。

China has been developing at a high speed in the past twenty years.

在过去的20年中，中国一直高速向前发展。

China's economic have developed at a high speed in the past 20 years.

在过去的20年中，中国一直高速向前发展。

China has been developing at high speed in passed 20 years.

在过去的20年中，中国一直高速向前发展。

China has developed at high speed in last twenty years.

在过去的20年中，中国一直高速向前发展。

In the past twenty years, China kept moving forward at high speed.

在过去的20年中，中国一直高速向前发展。

In the past twenty years, china has been developing at top speed.

在过去的二十年中，中国一直高速向前发展。

We walked on and on and at sunset, we found ourselves in a small mountain village.

我们不停地向前走，到太阳下山时，发现我们走进了一个小山村。

At the turn of the century, China has moved into anew stage for its modernization drive.

随着新世纪的到来，中国现代化建设进入了新的阶段，国民经济将以每年增长7％以上的速度持续向前发展。

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。