The eco-light is good for earth, and it's cost-effective and convenient, because it doesn't have to be changed every few months.
环保灯对地球来说是好的,而且它很省钱、方便,因为它不需要每隔几个月就更换一次。
While owning a motorcar might be convenient for the driver and his passengers, we also have to consider the environmental impact of this type of transportation.
虽然拥有一辆汽车对司机和乘客来说可能很方便,但我们也要考虑到这种交通工具对环境的影响。
If I do not hear from you to the contrary, I shall assume that it will be convenient for me to call at that time.
对此约定如不来信,我将认为于这个时间打电话是方便的。
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