三、細胞中核酸及蛋白質的化學修飾可以改變基因表達的活性，請舉出3種核酸或蛋白質的修飾可降低基因表達的活性，並說明原因。(10分)

20. Technology seems to be advancing daily, but the Pilot by Waverly Labs, the world’s first translation earpiece, might be a truly huge step forward for communication. The earpiece has microphones to isolate the speaker’s voice, sent to the app. The app runs speech recognition, translation and speech synthesis processes before sending the new speech to the listener’s earpiece. (8分)