英语语法分析

They were found to belong to the genera Lactuca and Pterocypsela.

这类植物分属莴苣属和翅果菊属。

The results indicate: the species within Lactuca L. (s. l. ) have the same pollen type.

结果表明：莴苣属（广义）内这些种具有相同的花粉类型。

Heating-crushing and heating extraction were applied to extracting juice from Lactuca Indica l.

采用热榨法和热浸提法对苦荬菜汁进行提取试验。