I was in under the canvas with guns.

帆布底下原来是大炮。

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I let go of the hand-rails and ducked under the canvas.

我放开把手，往帆布底下一钻。

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With the tent flap closed, the heat had been building up under the canvas.

帐篷上的门帘放下之后，热量就开始在帆布下聚集。

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And the jackets were stored under a canvas canopy, which may have hindered the passengers' desperate efforts to escape.

ECONOMIST: Unsafe waters

Taking refuge from enormous waves, hurricane winds and sub-zero temperatures under a thin canvas flap, the crew of James Caird miraculously arrived at their destination 16 days later.

ECONOMIST: Antarctic exploration

Geary is on the right side of the painting under the White Star flag, amid his troops, who stretch from the bottom of the canvas and up the right side.

WSJ: Capturing Gettysburg | Objects of Valor | State Museum of Pennsylvania | By Mark Yost