u-boat解釋n. 名詞 （德國）潛水艇。
The small ship came around the headland and steamed toward the u-boat.
The lethal power of the air in u-boat warfare was yet to come.
Battlefront : u - boat war commerce raiders
The coast line was crowded with u - boat nests
The u-boat should be so effectively countered that our convoys could count with comparative certainty on making a safe atlantic crossing.