blocks

• He sat down on a block of stone and tuned his harp .
  他坐在一块大石头上，弹起他的竖琴来。
• Two principal ports in north africa are seriously blocked .
  北非两个主要港口遭受严重封锁。
• Glass blocks are sometimes substituted for ordinary bricks .
  玻璃砖有时被用来代替普通的砖。
• He saw that the street further on was blocked by police cars .
  他发觉前面街道上停满了警车。
• The stumbling block is the mechanistic prediction of cloud cover .
  麻烦的是对云量的机械预报。
• The police blocked up the street where the gunman was hiding .
  警察封锁了带枪歹徒隐藏的街道。
• "columnar" joint blocks are formed by two sets of joints .
  “长柱状”节理块是由两组节理组成。
• Jack managed to pry away a large stone blocking the entrance .
  杰克设法移开了堵住门口的大石头。
• The reaction is the force f'exerted by the block on the man .
  其反作用力F’为物块对人施加的力。
• The crankcase is the lower part of the engine cylinder block .
  曲轴箱是发动机气缸体较低的部分。