空间距离和间隔

表示空间上的距离，间隔，范围等的常见词汇

空间间隔的常见表达

a distance of three kilometers

be at a distance of three kilometers

spaced at an interval of three kilometers

be closely spaced  间距很小

be evenly spaced 等距

时间距离与间隔

表示时间上的距离，间隔和范围等的常见词汇

时间间隔的常见表达

a time interval of two hours

two hours before/after

every five seconds  每五秒

every forth second  每个第四秒

• The average distance between two apparatus should not be too small in case of errors caused by the mutual influence.
  • 两个仪器之间的平均距离不应过小，以免互相影响造成误差
• The screw rod goes forward for a distance of the length of the pitch each time it takes a turn.
  • 螺旋每转一周可前进的距离为一个螺距
• The time interval for a particle to undergo a complete oscillation is called a period.
• Half-life if the period of time,for a substance undergoing decay,to decrease by half.