Plants like duckweeds float on the surface of still and slow - moving waters , while those with roots and flexible stems can stand in swift - flowing streams 一些如浮萍的植物漂浮在静止或慢速流动的水面，而一些植物的根和柔软的茎则可以立于快速流动的水流中。
Plants like duckweeds float on the surface of still and slow - moving waters , while those with roots and flexible stems can stand in swift - flowing streams 浮萍的植物漂浮在寂静或者流动缓慢的水面上，而那些有根系和柔韧茎干的植物就可以扎根在湍急的河川中。
Plants like duckweeds float on the surface of still and slow - moving waters , while those with roots and flexible stems can stand in swift - flowing streams 像浮萍一样的植物漂浮在静止和缓慢流动水面上，而那些有根而且茎干柔软的植物能在快速流动的溪流中站立。
Plants like duckweeds float on the surface of still and slow - moving waters , while those with roots and flexible stems can stand in swift - flowing streams 像浮萍类的植物，它们漂浮在静止和缓慢流动的水面上，而那些有根而且茎干柔韧的植物则能在快速流动的溪流中生长。
Duckweeds ( spirodela polyhiza ) were used as my experiment material in the present thesis to study physiological and biochemistryresponses to suoolementary uv - b radition 本文以紫萍( spirodelapolyhiza )为材料，研究了紫萍在生理生化机制方面的响应，以期为同类研究提供参考。
It features a picturesque artificial lake . with a lakeshore densely planted with willow trees and the water lilies and duckweed floating on the water , this place is an idyllic arcadia ：在这个明澈的人工湖景区，湖畔垂柳遍植，潭面水莲浮萍飘荡，仿如置身仙境，是个名不虚传的观光胜地。
Planting flowers invites the butterflies , and in the same way rocks invite clouds , the pine invites winds , a water pond invites duckweed , a terrace may be said to invite the moon , bananas invite the rain , and willows invite cicadas 艺花可以邀蝶，累石可以邀云，栽松可以邀风，贮水可以邀萍，筑台可以邀月，种蕉可以邀雨，植柳可以邀蝉。
Contents of cd , pb , cu and zn in duckweed and alternanthera philoxeroides there were determined . as a result , high loadings of zn and cu in both plants were found ; in the duckweed , high content of pb was also observed 对香花桥中小河流中生长的水葫芦和水花生cd 、 pb 、 cu 、 zn的含量进行测定，结果表明这两种水生植物zn和cu的累积量均很高；而浮萍对pb也有明显富集。
( 3 ) uv - b radiation increased the phenylalanina ammonia - lyase ( pal ) activity in leafy thallus of duckweeds , and as a consequence , flavonoids were accumulated . flavonoids synthesis induced by supplementary uv - b is an adaptive response of duckweeks under enhanced uv - b radition ( 3 )紫萍可以通过提高uv - b吸收物质如类黄酮合成酶苯丙氨酸氨裂解酶( pal )活性，促进类黄酮的积累来适应uv - b辐射的胁迫。
Have a rest and locate in brightness of flowers and birdsongs , sample the mystery of " bodhi of a flower and one world , a leaf one " silently ; look at the murmuring flowing water , try to figure out the secret that " a leaf duckweed belongs to the sea , where not to meet in life " quietly 小憩在鸟语花香处，静静地品味“一花一世界、一叶一菩提”的神奇；看着潺潺的流水，默默地揣摩“一叶浮萍归大海，人生何处不相逢”的奥妙。
