如果气候适宜的话，你可以种些每年落叶的树，比如说枫树，橡树，或者榆树，这样在夏天的时候就可以乘凉从而减少使用空调，并且在冬天树叶落光了也不会挡住太阳光。
If it's climate appropriate, planting deciduous trees such as maple, oak, or elm will provide shade in the summer to save on AC, while being leafless in the winter to not block the sun.
榆树任一种榆属的落叶树木，有拱形或曲线形树枝和锯齿形不对称的树叶。
Any of various deciduous trees of the genus Ulmus, characteristically having arching or curving branches and serrate leaves with asymmetrical bases. Elms are widely planted as shade trees.
榆树任一种榆属的落叶树木，有拱形或曲线形树枝和锯齿形不对称的树叶。
Any of various deciduous trees of the genus Ulmus, characteristically having arching or curving branches and serrate leaves with asymmetrical bases. Elms are widely planted as shade trees.
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