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1·Also packing of thick sections can produce sink marks on the part surface.

包装也会产生厚壁凹痕对部分表面。

2·The thin ribs applied in the back reinforcing structure can not only effectively improve the intensity of the weak beam, but also avoid sink marks on the front side of the beam.

本实用新型的背部加强结构薄筋既可以使弱梁的强度有效的增加，又可以避免弱梁的正面不出现缩痕。

3·Those marks began to flow, sink, change, disappear — tiny and common things had fallen into the turmoil before we approached the truth.

它们开始流转、下沉、变化、掠过、消失——微小普通在我们感到即将接近真理时陷入了大动荡。