Aim the photoresistors on the ground and you have instant obstacle avoidance - your robot will avoid the shadows cast on the ground by objects in the way.

把光敏电阻传感器对准地面，扫清地面上的障碍——你的机器人会避开在行进路线上的物体投影。

youdao

Browsers are not a proper platform for ria-on the contrary they are an obstacle and AJAX is supposed to be the way to circumvent around the obstacles of the browser.

浏览器并不是RIA的合适平台，反而是个阻碍，AJAX就是环绕在浏览器这个障碍上的。

youdao

The rise of the postdoc has created another obstacle on the way to an academic post.

博士后的增多为获取学术岗位带来新障碍。

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The rise of the postdoc has created another obstacle on the way to an academic post.

ECONOMIST: Why doing a PhD is often a waste of time

Another obstacle to the spread of on-board devices may be the availability of hand-held ones, in the same way that carphones have largely given way to mobile phones.

ECONOMIST: Clean machine

Ljubicic, who upset Britain's Andy Murray on his way to the semi-finals in Beijing last week, proved far less of an obstacle to Djokovic who always had control of the contest.

BBC: Rafael Nadal beats Stanislas Wawrinka in Shanghai