For certain wavelengths of light, routers along that path would accept signals coming in from only one direction and send them off in only one direction.

这条链路上的路由器对某种特定波长的光束，只接受从一个方向进入的信号，也只向一个方向发送这些信号。

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One way to get round this limitation is to set up a laser in mid-air, its beam sampling the molecules along its path as it returns to the source.

避免这个局限的一种方法是在两者之间放置一个激光器，它的光束在返回光源时对途径的分子进行取样。

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My old path along the banks of the Tigris, the one I had used since 2003, was finally rendered impassable by several new coils of razor wire.

我从2003年开始跑的底格里斯河沿岸被一些新的铁丝网拦住了，无法通过。

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But with the selection of a new CEO, Tides seized the opportunity to go in a new direction, and specifically to go along one that follows the path of so many of our clients.

FORBES: Tides: A Convener of Ideas, People, and Investments for Social Change

It is accessible along a dirt and sand path that crosses smaller dunes on one end.

CNN: Romancing the dune in Namibia

Setting out on an ocean voyage, with water in gourds and pounded tubers tied up in leaves, he would point his canoe into the right slant of wind, and then along a path between a rising star and an opposite, setting one.

ECONOMIST: Mau Piailug