He put his hand on the dog's flank.

他把手放在狗的胁腹上。

《柯林斯英汉双解大词典》

The most ominous sign that something big was brewing under the mountain developed on its north side. Within four weeks, this flank bulged out with hitherto unknown speed (see Figure 1).

最明显的征兆是山体下面的北侧在酝酿着某种活动，四个星期之内，这个侧翼以前所未有的速度膨胀出来(见图1)。

youdao

Spain and Holland, in particular, played lopsided systems - Spain often had Andres Iniesta on one flank, level with the midfielders, and David Villa on the other, looking to connect with the strikers.

特别是荷兰和西班牙的阵型其实并不平衡—西班牙经常让伊涅斯塔在侧翼，同中场球员位置持平，同时比利亚则在另一边伺机同进攻队员做配合。

youdao

Gallagher also owns tobacco business in Sweden and Austria, which would position Japan Tobacco for an assault from the western flank on the still smoking markets of Eastern Europe.

FORBES: Japan Tobacco Deal Is All About Russia

And no wonder that the Obama administration is looking for an exit plan from from the war in Afghanistan, which is hard enough to fight without having an exposed flank on the Pakistani border.

FORBES: The Pakistan Predicament

This year, the Welsh have lined up with George North on one flank and Alex Cuthbert on the other.

WSJ: Wales Unleashes Its Behemoths