我与房地产中介见了最后一次面，签好最终的文件后，他把房子的钥匙交给了我。

I met the real estate agent for the last time, signed the final papers and he handed me the keys.

youdao

有一点我是肯定的，快乐与由大脑产生的两把情感调节器的钥匙密切相关——血清素和去甲肾上腺素。

One thing I know for sure is that happiness is connected to two key mood regulators that our brains produce - serotonin and noradrenaline.

youdao

我的钥匙丢在汽车与房子之间的什么地方了。

I lost my keys somewhere between the car and the house.

youdao