The single-polechange-over slide switches has 2.54mm pitch pins come in straight or right-handed versions.
单杆改变了滑动开关有2.54mm间距针直或右手的版本来。
2
They sighted each pole, reading off measurements that were then used to calculate the change in elevation over each increment.
他们瞄准了每个极点，读出测量值，然后用这些测量值来计算每个增量上的海拔变化。
3
Here's how the seasonal change affects the weather: Around the time of the June solstice, the North Pole is tilted toward the sun and the Northern Hemisphere is starting to enjoy summer.