thornless

Small thornless tree or shrub of tropical America whose seed pods are a source of tannin .

热带美洲一种小而无刺的树或灌木，其豆荚是丹宁的来源。

Erect and almost thornless American hawthorn with somewhat pear-shaped berries .

美洲的一种直立的几乎无刺的山楂，其浆果呈梨形。

Friendship is the only one thornless rose in the word .

世上惟一无刺的一玫瑰，就是友情。

Rapid propagation of thornless blue Aloe by tissue culture

无刺番麻组织培养快速繁殖种苗的研究

Study on Tissue Culture and Rapid Propagation of Thornless Red Raspberry Idaeus

无刺红树莓组织培养快速繁殖技术研究

Thornless tree yielding heavy wood .

一种出产沉实木材的无刺的树。

Invaders such as purple-flowered Asian melastome and strawberry guava threaten to overrun delicate Hawaiian natives such as thornless roses and delicate tree ferns .

包括亚洲紫色野牡丹和草莓番石榴在内的外来物种肆意繁殖，威胁了脆弱的本地物种，如无刺玫瑰和树厥的生长。

Commercial berry growers spent decades trying to create a domesticated version of the black raspberry through crossbreeding but never succeeded : the thornless berries either tasted worse or produced almost no fruit , or they developed other problems .

商业浆果种植者花了几十年的时间试图通过杂交培育出一种家养黑覆盆子，但从未成功：无刺浆果要么味道更差，要么几乎不结果实，要么会产生其他问题。