潜艇在深海中航行。
The ___submarine is navigating in the deep sea.
他们在海底发现了水下植物。
They discovered ___submarine plants at the bottom of the ocean.
这家店的招牌是意大利潜艇三明治，里面塞满了火腿和奶酪。
The signature dish at this deli is an Italian ___submarine stuffed with ham and cheese.
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