TeX can recurse via macro expansion, but there is no call stack, no local variables, and deep recursion risks hitting engine limits. So the search uses three explicit loop levels, one for each depth:
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，详情可参考新收录的资料
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Hugo was born just before Christmas 2025, weighing nearly 7lbs, at Queen Charlotte's and Chelsea Hospital in west London.，详情可参考新收录的资料
Aircraft Classification — Shape-accurate SVG icons: airliners, turboprops, bizjets, helicopters，这一点在新收录的资料中也有详细论述
Countries should look to rewild their land borders as a deterrence to invasion and build up other geographical defences to attack, Europe’s environment chief has said.