Older water heaters can rust, collect sand and sediment in the bottom, and are also costing you 15% of your household’s energy dollars.

老旧热水器的底部会生锈，积灰并产生沉淀物，同时还会消耗15%的家庭能源。

youdao

You're right. The Li River is crystal clear, and no matter how deep the water is you can see the bottom-the pebbles, sand and weeds clearly.

对。漓江的水犹如水晶一样，晶莹清澈，不管水有多深，都清澈见底，能清楚地看到江底的沙石与杂草。

youdao

Menggulin oilfield is composed of conventional heavy oil sand reservoirs and conventional heavy oil bottom water conglomerate reservoirs.

蒙古林油田由普通稠油砂岩油藏和普通稠油砾岩底水油藏组成，油层单一，油水粘度比大，层间接替能力差、稳产难度大。

youdao

Bar: fully or partially submerged mound of sand, gravel or other unconsolidated material built on the sea-bottom in shallow water by waves and currents.

UNESCO: L O S S A R Y