The current was quite strong, and I just stayed behind the boulder.(水流非常強，攝影師只能呆在巨石后面。)

I was about to give up when I saw a pile of small stones jammed under a boulder.(我正打算放棄，忽然看見其中一塊圓石下面有一摞石頭。)

In Boulder, Colo., a surge of electricity on the power grid can largely go unnoticed.(在科羅拉多州波爾得市，大部分電網的電力波動都不被人們察覺。)

It is thought that the train hit a boulder that had fallen down a cliff on to the track.(人們認為這列火車撞到了從懸崖滾到鐵軌上的大圓石。)

They then walked hand in hand toward the large boulder that marks the area where Flight 93 crashed.(然后，兩人手挽手走向大卵石標記的93號航班墜毀地點。)

Given enough warning, it should be possible to push a threatening boulder out of the way.(如果予以足夠的警示，就有可能把一塊有威脅性的巨石推開。)

Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.(一旦你開始滾動巨石，它就產生動量，動量由它的質量和速度決定。)

In ancient times, a king had a boulder placed on a roadway.(古時候，一位國王將一塊巨石放在路上。)

Mediterranean: angry to see the glittering sea-pale boulder alive(它惱怒地看著閃爍的海面，巨大的卵石上爬著綠蜥蜴)

As with Sisyphus, the boulder was painstakingly rolled upwards only to tumble back down again in an absurd exercise of futility.(和西西弗斯一樣，巨石費力地向上滾動，結果又滾了下來，徒勞無功。)