sand pit

基本解释

ARAB countries own the biggest share of the Middle Eastern sand pit.
阿拉伯國家擁有中東沙坑的最大份額。
They then built the sand pit initially with bricks, covered the bricks with concrete and then put small stones into the concrete to keep the natural appearance.
然後就是用甎塊做沙坑，爲了保持自然形態，在甎頭上澆注了混凝土竝鋪上小石子。
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After that, river way influent seepage and sand pit influent seepage simulation are researched at western outskirt in Beijing.
在此基礎上進行了西郊地區河道入滲和砂石坑入滲模擬研究。

These terms are essentially trivial: amounting to little more than an admonition to play nice with the other boys and girls in the sand pit.
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A sandpit is a shallow hole or box in the ground with sand in it where children can play.