求翻译：量子阱是由一窄带隙半导体薄层夹在两宽带隙半导体层间的一种“三明治”结构，如在两层 间夹一 薄层构成的双异质结的单量子阱，如图5.28所示。是什么意思？

Quantum well by a narrow band gap semiconductor thin layer sandwiched between two wide band gap semiconductor layer, a "sandwich" structure, such as folders between two layers of a thin layer of double-heterostructure single quantum well, as shown in Figure 5.28 show.

Quantum mechanics is sinking by a narrow band gap semiconductor thin film clips in two wide-band gap semiconductor layer in a kind of " 3" sandwich structure, such as between the two layers of a thin double-specific quality of single quantum sinking, as shown in Figure 5.28 .

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Narrow-band gap semiconductor quantum well consists of a thin-layer sandwiched in between two wide-band-gap semiconductor layer "sandwich" structure, where to clamp a thin layer between two layers of double heterojunction consisting of single quantum well, as shown in Figure 5.28.

The quantum pitfall is clamps by a narrow band gap semiconductor thin layer in two width band gap semiconductor level one kind “the sandwich” the structure, if clamps the single quantum pitfall in during two which a thin layer constitution the double neterogeny ties, as shown in Figure 5.28.