Loss
the fact that you no longer have something or have less of something
喪失，失去
He suffered a gradual loss of memory.
他的記憶力越來越差了。
At a loss
not to know what to do or say
不知所措；不知說甚麽
I’m at a loss to know how I can help you.
我不知道該怎麽幫你。
Lose
to no longer have something because you do not know where it is
丟失，遺失
I’ve lost my ticket.
我丟了票。
Got lost
not knowing where you are and how to get to a place
迷路的，走失的
I got lost in the New York subway system.
我在紐約地鐵裡迷路了。
Lose sb
to explain something in a way that is not clear to (someone) : to confuse (someone)
講到…聽不懂了
I’m sorry. You’ve lost me.
Lose it (informal)
to stop being able to control your emotions and suddenly start to shout, cry, or laugh
失去理智；突然大叫（或哭、笑）
I’d been trying so hard to stay calm but in the end I just lost it.
我拼命想保持冷靜，但最終還是沒有控制住自己。
