But he looks at the pile of arrowheads, thinks they're a gift, picks them up, smiles and walks off.
但他看着一堆箭头，以为是礼物 就捡起来冲你一笑就走了

This may only take a moment, but those moments pile up and eat into time that could be spent doing other things.
做这件事可能只消片刻，但一个个片刻累积起来，便消耗掉了本可去做其他事情的时间。

Make sure that you dont wait until problems pile up before making a reckoning that would be firing belated shots.
切记不要使问题成了堆, 才来一个总结, 放马后炮。

I remember watching the pile of freshly laundered shirts stack up and I thought it behoved me to try and iron one.
我记得看着一叠刚洗好的衣服，我想我应该试着烫一烫。

A great deal of alkali residue has no place to pile up, causing the great pollution of the environment of Jiao Zhou Bay.
大量的碱渣无处堆放，造成了胶州湾环境的极大污染。