sand drop的意思|示意

The striking drop in numbers round British coasts of such seabirds as arctic terns, kittiwakes, guillemots and puffins is probably a result of the disappearance of sand eels.

在英国周围的海岸，象北极燕鸥、三只鸥、海雀和海鸭等海鸟数量的显著减少，可能是由于玉筋属鱼类消失导致的。

Sooner or later, the sand and the particles of rock drop from the wind to the ground.

砂土和岩石的碎粒迟早会从风里落到地面上。

The common defects of the housing casting include cracks, sand drop, slag inclusion, shrinkage porosity and rough grain, etc.

机架的常见缺陷有裂纹、掉砂、夹渣、缩孔缩松和晶粒粗大等。