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"Even if mobile phones are banned, if a teacher simply reads from the textbooks, students will still struggle to concentrate. The main factor in retaining students' attention is the quality of teaching," he said.

"Everyone can quickly comment or post articles in the internet era, but if they don't clarify that they are the owners of the works or disclose their copyright registration at government agencies, it'll be a challenge for others to find out where the works are originally from, let alone get authorization after contacting the authors," Liu said.

"Every time we talk about denuclearization of North Korea, we're talking about unilateral dismantlement of North Korea's nuclear weapons program," Terry said in a discussion on Wednesday.

"DPRK's intention is very clear-as long as the US gives it peace and space, it will abandon the nuclear and concentrate on economic development," he said, adding that the US may not want to fulfill Kim's expectations as Trump's global strategy is to use force to establish US leadership around the world.

"Excavators are not just used for basic construction," Huang said. "They are also used in advanced projects such as wind power farms, industrial housing, smart city developments and medical equipment factories."