Jack-knife
n. 大折刀\\nvt. 用大折刀切/戳\\nvi. 彎身, (分節連接的車輛在打滑時)中間突然彎折失控
?? 牛津釋義
jack-knife
n
pl -knives
1 large pocket-knife with a folding blade （可放衣袋內的）大摺刀.
2 (sport 體) dive in which the body is first bent double and then straightened 屈體跳水. jack-knife v [I]
(esp of an articulated lorry) bend sharply in the middle into a V-shape, usu as the result of an accident （尤指鉸接的貨車）彎成V字形（通常因交通事故所致）
A heavy lorry has jack-knifed on the motorway, causing long delays. 一輛重型鉸接貨車在高速公路上撞成V字形, 耽擱了很長時間.
?? 詞語組成解析
jack
[[d??k]]
n. 插座, 千斤頂, 男人\\nvt. 抬起, 提醒, 扛舉, 增加, 提高, 放棄\\na. 雄的\\n[計] 插座
knife
[na?f]
n. 刀;匕首;刃部;手術刀;
vt. 切割，刺;傷害;
vi. 劈開;劃過;
??? 情景例句
but I don't want to put it off too long.
但我希望不要拖得太久。
What time does the ship leave?
船什么時間啟航？
Sometimes were go upstream to a favourite backwater, sometimes we have our party at the boathouse,
有時，我們溯流而上來到我們喜愛的回水河汊舉辦；有時在船塢舉辦。