Definition: relating to, or involving the sun Level: B2
我们应该更多地投资太阳能。
We should invest more in ___solar energy.
这栋房子使用太阳能供暖以降低成本。
The house uses ___solar heating to reduce costs.
安装太阳能电池板将减少我们的电费。
Installing ___solar panels will reduce our electricity bills.
