为什么葡萄干没有籽？

葡萄干是一种受人喜爱的小吃，无论是独自享用还是作为食品添加剂，都有着广泛的应用。然而，相比新鲜葡萄，葡萄干却没有籽，这引发了人们的好奇。为了解答这个问题，我们需要深入了解葡萄干的产生过程。

葡萄干是通过将新鲜葡萄晒干而制成的。晾晒葡萄的过程中，水分会被蒸发掉，从而使葡萄变得干燥。在这个过程中，葡萄籽也会经历一些变化。葡萄籽内部的水分开始流失，导致籽的膨胀。随着干燥的进行，籽的外壳逐渐变硬并变得脆弱。这样，当葡萄干形成之后，籽就变得非常容易被挤出。

英文翻译：Why don't Raisins have seeds?

Raisins, a beloved snack enjoyed either on their own or as an ingredient in various food products, raise curiosity due to the absence of seeds compared to fresh grapes. To answer this question, we need to delve into the process of raisin production.

Raisins are made by drying fresh grapes. During the drying process, water content within the grapes evaporates, resulting in their dehydration. As this happens, the grape seeds also undergo changes. The moisture inside the grape seeds begins to deplete, causing them to expand. With progressive drying, the seed coats become harder and more brittle. Consequently, when raisins form, the seeds become very easy to dislodge.

葡萄干之所以没有籽，还有一个原因与葡萄的育种有关。为了生产无籽葡萄，人们已经进行了长期的选择育种工作。无籽葡萄是由自然突变得到的，这些葡萄中没有发育出籽或者籽非常小。选择和繁殖这些无籽葡萄，最终形成了没有籽的葡萄干。

英文翻译：Another reason why raisins are seedless has to do with grape breeding. There has been a long history of selective breeding to produce seedless grapes. Seedless grapes are obtained from natural mutations where either no seeds or very tiny seeds develop. By selecting and propagating these seedless grapes, the seedless raisins are eventually formed.

值得一提的是，虽然大多数葡萄干没有籽，但仍然可以找到一些有籽的葡萄干品种。这些葡萄干通常也被称为“带籽葡萄干”，并且一般比无籽葡萄干更大更多汁。带籽葡萄干常常作为烘焙食材使用，因为籽可以在制作面包和饼干等食品时提供额外的口感。

英文翻译：It is worth noting that while most raisins are seedless, there are still some varieties of raisins with seeds. These raisins are often referred to as "seeded raisins" and tend to be larger and juicier compared to seedless raisins. Seeded raisins are commonly used as baking ingredients since the seeds can provide an additional texture when making bread and cookies, among other food products.

综上所述，葡萄干之所以没有籽，一方面是因为干燥过程中籽变得脆弱易碎，另一方面则与育种工作相关。无论如何，葡萄干作为一种美味健康的零食，其无籽特点使其更具便利性和食用价值。

英文翻译：In conclusion, the absence of seeds in raisins is attributed to the brittleness and fragility of the seeds during the drying process, as well as selective breeding. Nevertheless, whether seeded or seedless, raisins remain a delicious and healthy snack, adding convenience and culinary value to various dishes.