The word 检测 is formed by combining two independent characters, each with its own meaning, to create a new, more specific concept. The first character, 检 (jiǎn), carries the core idea of examining, inspecting, or checking. The second character, 测 (cè), contributes the notion of measuring, surveying, or testing. When placed together, they form a coordinated compound where both components contribute equally to the final meaning, resulting in the comprehensive sense of "to test and measure" or "to inspect and survey", effectively meaning to detect or to test.