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Estimable readers! My name is Ray Zhong, and I’m a tech reporter based in Beijing.

My patch of the world is rarely out of the news these days; President Trump’s trade fight has made sure of it. But with all the tariffs and talks, it’s easy to forget how this all got started: China wants to build a high-tech economy, and the Trump administration says it is doing so using unfair tactics, such as forcing American companies to share their know-how.

This is why the White House sounded so galled this week when Beijing responded to Washington’s recent tariffs not by addressing those practices, but by imposing tariffs of its own.

“We have been very clear and detailed regarding the specific changes China should undertake,” Robert E. Lighthizer, the United States trade representative, said on Tuesday. “Unfortunately, China has not changed its behavior — behavior that puts the future of the U.S. economy at risk.”