... etched photomask 金属腐蚀的光刻掩膜 Etched Lines 刻蚀线条 Etched Simple 刻纹简单 ...
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etched simple
蚀刻简单
以上为机器翻译结果,长、整句建议使用 人工翻译 。
The shells are etched with simple geometric forms that are still used by Kalahari tribesmen to mark ownership of the shells, which they employ as water vessels.
FORBES: Human Ingenuity: A 100,000-Year-Old Story
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