at single anchor的用法和樣例：
例句
- I accidentally bit into the hard seed at the center of the peach.
我不小心咬到了這個桃子的核。 - Just at that moment the guest drops the glass carelessly and breaks it.
就在這時，那位顧客不小心把杯子打爛了。 - I can't say I'm at all pleased by their negligence.
我不能說他們的疏忽使我高興。 - The new man was asleep at the switch and the two trains crashed.
新來的人疏忽職守沒有扳道而使兩列火車相撞了。
