1. 天;天空
The sky is the space around the earth which you can see when you stand outside and look upwards.
e.g. The sun is already high in the sky.
已经日上三竿。
e.g. ...warm sunshine and clear blue skies...
温暖的阳光和蔚蓝的晴空
2. pie in the sky -> see pie
名词天（空）
及物动词将…击向空中; 将…高挂
1. under the open sky : 在户外, 露天；
2. under a foreign sky : 在异乡；
3. to the sky : 到天国, 极度；