Read the passage below:
Deep ocean water is stratified into distinct thermal layers, with warm surface water abruptly transitioning to colder depths along a boundary known as the thermocline. Because sound velocity changes with water temperature, acoustic signals emitted by surface vessel sonar refract sharply when striking this boundary rather than traveling in a straight line. The resulting bending of sound waves creates expansive shadow zones in the water column where acoustic energy cannot penetrate. Naval submarine commanders routinely position their vessels directly beneath these thermal boundaries during patrol operations.
Based on the passage, complete the statement that expresses the author's implied central claim:
Cevap:The author implies that naval crews exploit ocean thermal boundaries to 【conceal】 submarines from surface sonar detection.
Cevap
conceal (or acceptable synonyms: hide, shield, mask, cloak, protect, screen, evade, disguise)
The author outlines how the thermocline bends sonar pings to form impenetrable shadow zones and concludes by noting that commanders intentionally operate within these areas. Combining these facts yields the unstated main idea: submarines use ocean temperature stratification to conceal themselves from active surface sonar.
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Anahtar Kavram
Synthesizing supporting factual details to deduce an unstated operational purpose and central thesis.
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