Packet switching centre
[计] 包交换中心
🧩 词语组成解析
[计] 交换\\n[经] 转换, 调换, 调头
centre
['sentər]
n. 中心;（市镇的）中心区;中心点;中枢;
vt.& vi. 置于中央;集中;把…当作中心;（使）成为中心;
🗣️ 情景例句
I feel as though I have been standing here for 50 days.
可我感觉像是在这里站了50天。
The spirit is willing but the flesh is weak.
心有馀而力不足。
it requires 97 per cent less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth's surface into orbit!
因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。