Hitting the homestretch in fall: on a former railroad bridge in the Great Allegheny Passage in Pennsylvania.
在秋天里返家的最后旅途上冲刺：在之前宾夕法尼亚州阿勒格尼大公路的铁道桥上。
This functioned as a selective bridge, permitting the passage of positively charged sodium ions, but not negatively charged chloride ions.
它可以作为有选择的桥梁让带正电的钠离子通过，同时阻止了带负电的氯离子。
I can't believe you've never done this. Crossing the bridge is like a rite of passage.
我不敢相信你从来没这么干过。穿过这座桥可算个人生大事。
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