... 景深field-depth 景深depth of definition 景深,景物的清晰深度definition in depth ...
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depth of definition
清晰度深度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So by firing radio pulses through the overlying sheet and recording the return echoes, scientists can plot both the depth of the rock bed and - by definition - the thickness of the ice covering.
BBC: Antarctic ice volume measured
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