Chinese exports to the rest of the world surged in May as Covid-19 restrictions eased, adding to signs of recovery in the world’s second-largest economy after months of punishing pandemic lockdowns. The year-over-year rebound in exports, which was much bigger than economists were expecting, suggests overseas orders for Chinese goods had piled up during previous months when factories were idle and port traffic collapsed amid stringent Covid containment measures in major cities, most notably Shanghai.