Traveller hooks (made from knitting needles)
In turn, warships are constantly attempting to listen with passive sonar to avoid sneak attacks. If suspicious of close submarine contact, they will turn to active sonar to more accurately locate and attack first.
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他透過窗戶觀看，發現屋外出現眾多執法人員，「我就知道他們是衝著我們這個房子來的。」