Securitron
电子防护系统
🗣️ 情景例句
Please come and see me in my office on the 20th floor.
请到二十楼我的办公室来见我。
She sent me a Christmas card last year.
去年寄过一张圣诞卡。
They will arrive in half an hour.
他们将于半小时之内到达。