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Leaves alternate, simple, pinnately veined, entire to irregularly serrate or lobed, rarely pinnatifid; stipules absent or rarely present.

叶互生，单叶，羽状脉，全缘、有不规则的有锯齿或者浅浅裂，很少羽状分裂；存在的无托叶或很少。

Leaf blade ovate or oblong, base rounded, rarely shallowly cordate; inflorescence glabrous or puberulous, rarely densely pubescent.

或长圆形的叶片卵形，基部圆形，很少浅心形；花序无毛或被微柔毛，很少密被短柔毛。

Flowers bisexual or very rarely female, globose to pyriform or rarely ovoid in bud.

花两性或极少雌性，在芽中球状到梨形或很少卵球形。

Fruit narrowly oblong, 1.5-2.3(-3) mm wide; petals lavender, purplish, or rarely white; cauline leaves dentate or denticulate, rarely repand or entire

果狭长圆形，1.5-2.3(-3)毫米宽；花瓣淡紫色，略带紫色，或很少白色；茎生叶有齿的或具小齿，很少残波状的或全缘 3 T。

Basal leaves rarely up to 10, not rosulate or rarely obscurely rosulate; petioles neither thickened nor broadly winged

很少基生叶可达10，并非莲座状或很少不明显；叶柄既不加厚也非具宽翅 2b var。 oleifera 芸苔

Fruit 1-loculed, 1-seeded, rarely 2-seeded, usually a drupe, rarely samaroid.

果1室，1种子，很少2种子，通常为核果，很少翅果状。

Herbs or shrubs, rarely trees, erect, rarely scandent.

草本或灌木，很少乔木，竖立，很少攀缘。

Fruit either an indehiscent, rarely explosively dehiscent, sometimes winged, schizocarpic capsule, or a ± fleshy drupe with 1-4 indehiscent, rarely dehiscent, pyrenes.

果，两个其中一个个不裂，很少爆裂开的，有的具翅，裂果蒴果，或多少肉质的核果具1-4不开裂，很少开裂的小坚果。

Carpels 2, rarely 3-5(-10), usually ± connate; ovary superior or semi-inferior to inferior, 2- or 3-5(-10)-loculed with axile placentation, or 1-loculed with parietal placentation, rarely with apical placentation; ovules usually many, 2- to many seriate, crassinucellate or tenuinucellate, sometimes with transitional forms; integument 1- or 2-seriate; styles free or ± connate.

心皮2，很少3-5(-10)，通常多少合生；半不如下位的子房上位或，2-或3-5-10室具中轴胎座，或1室具侧膜胎座，很少具顶端placentation；通常胚珠很多，2-在很多具薄珠心的crassinucellate或，有时具过渡形式，seriate；珠被1或2 seriate；花柱离生或多少合生。

Leaves few to many, basal; leaf blade puberulent to pilose, rarely sericeous or velutinous, base cuneate to cordate, rarely peltate.

叶少数到多数，基部；叶片被微柔毛的到具柔毛，很少被绢毛的或茸毛，基部楔形到心形，很少盾形。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。