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(guó)已針對(duì)進(jìn)口海綿鈦可能對(duì)國(guó)家安全構(gòu)成的威脅展開調(diào)查，海綿鈦是一種廣泛應(yīng)用于航空航天領(lǐng)域的產(chǎn)品，美國(guó)主要從日本購買。
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