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.
美國已針對進口海綿鈦可能對國家安全構成的威脅展開調查,海綿鈦是一種廣泛應用於航空航天領域的產品,美國主要從日本購買。
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