梨子的英语自我介绍 The pear is a fruit tree of genus Pyrus(/ˈpaɪrəs/)and also the name of the tree's edible pomaceous fruit.The pear is classified in subtribe Pyrinae within tribe Pyreae and is a perennial.The apple(Malus domestica),which it resembles in floral structure,is also a member of this subcategory. The English word“pear”is probably from Common West Germanic pera,probably a loanword of Vulgar Latin pira,the plural of pirum,akin to Greekἄπιοςapios(from Mycenaeanápisos),which is likely of Semitic origin.The place name Perry and Pharisoulopol can indicate the historical presence of pear trees.The term"pyriform"is sometimes used to describe something which is"pear-shaped". Botany Pears are native to coastal and mildly temperate regions of the Old World,from western Europe and north Africa east right across Asia.They are medium-sized trees,reaching 10–17 m tall,often with a tall,narrow crown;a few species are shrubby.The leaves are alternately arranged,simple,2–12 cm long,glossy green on some species,densely silvery-hairy in some others;leaf shape varies from broad oval to narrow lanceolate.Most pears are deciduous,but one or two species in southeast Asia are evergreen.Most are cold-hardy,withstanding temperatures between−25°C and−40°C in winter,except for the evergreen species,which only tolerate temperatures down to about−15°C.The flowers are white,rarely tinted yellow or pink,2–4 cm diameter,and have five petals.Like that of the related apple,the pear fruit is a pome,in most wild species 1–4 cm diameter,but in some cultivated forms up to 18 cm long and 8 cm broad;the shape varies in most species from oblate or globose,to the classic pyriform'pear-shape'of the European Pear with an elongated basal portion and a bulbous end. The fruit is composed of the receptacle or upper end of the flower-stalk(the so-called calyx tube)greatly dilated.Enclosed within its cellular flesh is the true fruit:five cartilaginous carpels,known colloquially as the"core".From the upper rim of the receptacle are given off the five sepals[vague],the five petals,and the very numerous stamens. The pear is very similar to the apple in cultivation,propagation and pollination.The pear and the apple are also related to the quince. Pears and apples cannot always be distinguished by the form of the fruit;some pears look very much like some apples.One 本文来源：https://www.wddqw.com/doc/d3f04d073a68011ca300a6c30c2259010202f3a7.html