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光波,无论是以太波还是其他波,在所有情况下都是时间上的周期性过程。
能源行业不仅仅是开采资源;它是推动进步和改善生活的力量。
We suffer from an incurable disease called hope.
A wise man proportions his belief to the evidence.
The more you do, the more you learn. The more you learn, the more you can do.