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重点讲解：
1. pick up 接收到（信号或声音）；
The crew of Philante picked up a distress signal from the yacht Sans Peur III.
“菲蓝特”的船员接收到了“无畏者三号”游艇发出的遇险信号。
2. along with 与…一起；
An oil seal was replaced, along with both front wheel bearings.
换了一个油封和两个前轮轴承。
3. pin down 确定；证实；
It has taken until now to pin down its exact location.
直到现在才确定了它的准确位置。
4. compared to 与…相比；和…比起来；
Standards in health care have improved enormously compared to 40 years ago.
与40年前相比，卫生保健的水平得到了极大提高。
n. 闪电
adj. 闪电般的，快速的
