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Leaf blade usually lanceolate to ovate, rarely linear or subulate, herbaceous, rarely leathery.

叶片通常披针形的到卵形，很少线形的或钻形，草质，很少革质。

Leaves simple, opposite, rarely whorled or alternate, pinnately veined; stipules absent or rarely present.

单叶，对生，很少轮生或互生，羽状脉；存在的无托叶或很少。

Flowers small, bisexual or rarely unisexual, actinomorphic, rarely zygomorphic.

花小，两性或很少单性，，很少左右对称。

Flowers solitary, sessile, rarely clustered and stalked, bisexual, rarely unisexual, actinomorphic or occasionally zygomorphic.

花单生，无梗，很少丛生并有柄，两性，很少单性，辐射对称或者偶尔左右对称。

Seeds uniseriate or rarely biseriate, winged, margined, or wingless, oblong, plump or flattened; seed coat minutely reticulate, mucilaginous when wetted; cotyledons incumbent or rarely accumbent.

双列，具翅的种子单列或很少，边缘，或无翅，长圆形，扁平的肥厚的或；网状，黏的种皮微小的被弄湿；子叶现任的或很少依着。

Seeds biseriate or rarely uniseriate, wingless or narrowly margined, oblong, plump or slightly flattened; seed coat minutely reticulate, copiously mucilaginous when wetted; cotyledons incumbent or rarely accumbent.

单列的种子双列或很少，无翅或狭边缘，长圆形，肥厚或稍扁平；网状，丰富黏的种皮微小的被弄湿；子叶现任的或很少依着。

Petals 5 or rarely more, white or rarely pale yellow, basally slightly connate and adnate to stamens.

花瓣5或很少更多，白色的或很少浅黄的，基部稍合生和贴生于雄蕊。

Shrubs (sometimes scrambling or rarely somewhat climbing) or rarely small trees, monoclinous or andromonoecious, armed or unarmed, apparently without oil glands.

灌木或很少小乔木，雌雄同花或雄花两性花同株，具刺或无刺，表面没有油腺体。

Fruit juicy or dry, naked, scaly, hairy, bristly, or spiny, indehiscent or dehiscent, when juicy then pulp derived from often deliquescent funicles. Seeds usually numerous, often arillate or strophiolate; embryo curved or rarely straight; endosperm present or absent; cotyledons reduced or vestigial, rarely leaflike.

果多汁或干燥，裸露，有鳞片，有毛，具刚毛，或者具刺，不裂或开裂，种子通常多数，通常具假种皮或具种阜；胚弯曲或很少直；胚乳提出或无；子叶退化或者残留，很少叶状。

Leaves simple, usually alternate, rarely opposite or verticillate, sometimes crowded at apices of branches; stipules usually small and caducous, sometimes larger, leaflike and persistent, rarely absent; petiole generally present, sometimes with apex 2-glandular and/or with additional glands along petiole length; leaf blade usually pinnate-veined, sometimes 3-5-veined from base or palmate-veined, with or without pellucid dots or lines, sometimes with a pair of glands at junction of blade and petiole, margin entire or toothed, teeth glandular or not. Inflorescences axillary, terminal, or cauliflorous, of various forms: racemose, spicate, cymose, corymbose, or paniculate, sometimes flowers fasciculate, or solitary; pedicels often articulate; bracts and bracteoles usually small to minute.

单叶，通常互生，很少对生或轮生，有时在枝端簇生；托叶通常小并且早落，有时大，叶状并且宿存，很少无；叶柄通常存在，有时先端有2个腺体，或沿着叶柄有腺体；叶片通常羽状脉，有时基部3-5出脉或掌状脉，有或无透明小圆点或线，花序腋生，顶生，或者茎生，或多种形式：总状，穗状，聚伞状，伞房状，或者圆锥状，有时花束状，或者单生；花梗通常有节；苞片和小苞片通常小到微小。

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。