Simply put some sand in the bottom of the jar (colored play sand works great for this) and add the seashells.
只要将沙子铺到瓶底，(如果是彩沙就更漂亮了)然后再放入贝壳。
On top of this mess, some sand was deposited, buried, lithified into rock, and brought back up to the surface yet again.
在这堆岩层的上面，一些沙子沉积、掩埋、固化成岩，然后又被带回到表面上。
Sometimes, we will play games on the beach or make some sand sculptures.
有时候，我们会在沙滩上玩一些游戏或者做一些沙雕。
There was an old lady who swallowed some sand.
有个老太太她吞了一些沙子。
And you may fall sometimes, but even if you fall, you should understand how to grasp some sand in your hand.
你总会摔倒，即使摔倒，也要懂得抓一把沙子在手里。
Then one morning one of the sailors saw land, but the next minute our ship hit some sand just under the sea. The ship could not move and we were really in danger now.
一天早上，一个水手瞧见了陆地，但紧接着我们的船就触到了海底的沙滩，船没法移动，我们此刻真正地陷在了危险之中。
The authors also try to improve grain composition of soil by replacing cement soil with some sand to reduce influence of environmental change to strength of cement improved soil.
本文还通过在改良土中置换一定比例的砂土来改善土料的颗粒级配，以降低循环失水对水泥土强度的影响。
The authors also try to improve grain composition of soil by replacing cement soil with some sand to reduce influence of environmental change to strength of cement improved soil.
本文还通过在改良土中置换一定比例的砂土来改善土料的颗粒级配，以降低循环失水对水泥土强度的影响。
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