<p>➀ Chinese researchers developed a magnetic sensor-equipped capsule robot for non-invasive gut fluid sampling, validated in pig intestines;</p><p>➁ The capsule combines passive mechanics, external magnetic actuation, and real-time sensor tracking for precise positioning and power-free operation;</p><p>➂ It collects samples through spring-driven suction and seals them internally, enabling retrieval post-excretion for diagnostic analysis.</p>