滑轮组

Because it is like a giant block and tackle

因为它像一个巨型滑轮组。

It has to be tall because it is like a giant block and tackle

井架必须很高，因为它像一个巨型滑轮组。

A block and tackle is needed to lift that heavy machine .

要吊起那么重的机器需要使用一个滑轮组。

It has to be tall because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.

井架必须很高，因为它像一个巨型滑轮组。我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

"Block and tackle: Combination of pulleys with a rope or cable, commonly used to augment pulling force."

滑轮和滑车组：带绳索和缆绳的滑轮组，通常用于增大拉力。

The design instruction booklet has mainly designed 5 ton hoist reels, the reel axis, as well as the block and tackle.

本设计主要设计了5吨卷扬机的卷筒、卷筒轴、卷筒毂、减速器以及滑轮组。

"Block and tackle: Combination of pulley s with a rope or cable, commonly used to augment pulling force."

滑轮和滑车组：带绳索和缆绳的滑轮组，通常用于增大拉力。

It has to be tall because it is like a giant block and tackle, and we have to lower into the ground NEW CONCEPT ENGLISH-BOOK FOUR and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.

井架必须很高，因为它像一个巨型滑轮组。我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

In the project of Dongfang-Yangpu-Haikou Long Distance Transportation Pipeline Crossing through Changhua River, the construction technique of launch way with slide boards is utilized, that is, the pulley block fixed on opposite bank tows the pipeline directly. The pulley block of a 32t low speed windlass successfully towed the integral pipeline section through the river.

在海南东方－洋浦－海口输气管道工程的昌化江穿越施工中，采用了发送道滑板施工技术：滑轮组过江直接牵引管道，32t慢速卷扬机牵引滑轮组将管道整体牵引过江，牵引穿越一次成功。

The fixed set of pulleys located at the top of the derrick or mast, over which the drilling line is threaded.

位于重型井架或桅架式井架顶部的固定的滑轮组，通过该滑轮组钻井钢丝绳进行穿绳。

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。