The US has launched an investigation into the possible threat to national security posed by imports of titanium sponge — a product that is widely used in the aerospace sector and mostly bought from Japan.
美国已针对进口海绵钛可能对国家安全构成的威胁展开调查，海绵钛是一种广泛应用于航空航天领域的产品，美国主要从日本购买。
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