Jack bolt
[化] 定位螺栓
?? 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
bolt
[bolt]
n. 螺栓，螺釘;閃電，雷電;門閂;弩箭;
vt. 篩選;囫圇吞下;（把門、窗等）閂上;突然說出，脫口說出;
vi. （門窗等）閂上，拴住;沖出，跳出;（馬等的）脫韁;囫圇吞下;
adv. 突然地;像箭似地;直立地;
??? 情景例句
Is there a limit to how many I can purchase at this price?
我買這種東西在數(shù)量上有什么限制嗎？
I was little ill at ease.
我有點(diǎn)不自在。
It was warm last Sunday, so I went and sat on the river bank as usual.
上星期日天氣很暖和。于是我和往常一樣，又去河邊坐著。