Operational life span
[计] 使用寿命
🧩 词语组成解析
life
[laɪf]
n. 生活，生计;生命，性命;一生，寿命;人生，尘世;
span
[spæn]
n. 共轭（马、骡）;跨度，墩距;一段时间;[航] 跨绳;
vt. 缚住或扎牢;跨越时间或空间;以掌测量;以手围绕测量类似测量;
🗣️ 情景例句
You and Dad are like ships that pass in the night.
你和爸爸就像在夜晚交错而过的船一样。
What platform does the train leave from?
这班车从哪个站台开出呢？
Lights were blazing and men were running here and there: they had just discovered that a prisoner had escaped.
他们刚刚发现有一个俘虏跑了。