Stems single or several and cespitose , branched above, densely hispid, hairs discoid at base; branches slender, spreading.
茎单一或数个和丛生，上面分枝，密被糙硬毛，毛盘状的在基部；分枝纤细，平展。
The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.
植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。
The general exposure stems from the fact that the SACK option receiver can be made to do an arbitrary amount of work based on the reception of a single packet.
常见的安全漏洞源于这样一个事实：SACK 选项的接收方在收到一个包后可能会被要求做大量工作。
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