A line of trees fringed the pool.

水池周围种植着一排树木。

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A line of trees fringed the river.

一行树木排列在河边。

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The 'lines' need not be actual lines - they could be the shape of a path, a line of trees, a fence, river or any other feature in an image.

所谓的线并不是条实际存在的线——它可以是一条小路、一排树、一排围栏、一条河或者其他任何在图中出现的东西。

youdao

That's what you need for a phalanx, because to maintain the integrity of the hoplite line, you can't have bumps and grooves, and trees and rivers in the way; it will break things up.

而是方阵作战所必备的条件,为了维持重装步兵队列的完整性,就不能在坑坑洼洼,有树林有河流的地方布阵,这会把方阵打散

耶鲁公开课 - 古希腊历史简介课程节选

Congolese army soldiers pointed out the flashes of gunfire coming from the Rwandan border, marked by a line of trees.

BBC: Congo exodus as terror spreads

On the western boundary stood a line of ash trees that he wished, in dictatorial moods, to cut down, because they filled his garden with seeds.

ECONOMIST: Christopher Lloyd

You could follow it from there by looking at the empty spaces in a solid line of trees, the rootballs waving their witchy root toes in the air.

WSJ: Anna Quindlen on a Message Delivered by Tornado | House Call