self
作不及物动词，主语通常是植物或生物个体，后面不接宾语。
These plants can self without any pollinators.
这些植物无需传粉者就能自花授粉。
自体受精；自花授粉
selfing — present participle of self
同系交配；近亲繁殖；由同一个体受精；自体受精或自花授粉。；由同一品系受精；近亲繁殖。；使近亲繁殖；使自花授精
由同一个体受精；自体受精或自花授粉。
To fertilize by the same individual; to self-fertilize or self-pollinate.
由同一品系受精；近亲繁殖。
To fertilize by the same strain; to inbreed.
一般现在时
This variety selfs readily in warm conditions.
这个品种在温暖条件下容易自花授粉。
一般过去时
The botanist selfed the flowers to produce a pure line.
植物学家让这些花自花授粉以产生纯系。
现在完成时
These tomatoes have selfed without any intervention.
这些番茄在没有任何干预的情况下已经自花授粉。
规则动词：过去式和过去分词均为 selfed。
To keep the strain stable, the researcher selfed the plants for three generations.
为了保持品系稳定，研究人员让这些植物自交了三个世代。
用法提示：这里 selfed 是 self 的过去式，作及物动词，表示“使自交/自花授粉”。
This variety of tomato will self even without wind or bees.
这种番茄品种即使没有风或蜜蜂也会自花授粉。
用法提示：这里 self 是不及物动词，表示“自花授粉”，主语为植物。
Selfing a crop can reduce its genetic diversity over time.
让作物自交会随着时间降低其遗传多样性。
用法提示：这里 selfing 是 self 的动名词形式，作主语，表示“自交”这一行为。
作不及物动词，主语通常是植物或生物个体，后面不接宾语。
These plants can self without any pollinators.
这些植物无需传粉者就能自花授粉。
作及物动词，宾语多为植物、品系等；过去式和过去分词都是 selfed。
The breeder selfed the wheat to keep the line pure.
育种者让这种小麦自交，以保持品系纯正。
grammar · medium
易错句子This variety of wheat selves readily in warm weather.
正确表达This variety of wheat selfs readily in warm weather.
动词 self 的第三人称单数是 selfs，直接在词尾加 -s；selves 是名词 self（自我）的复数形式，不能作动词。汉语学习者常把名词的复数变化误套到动词上。
grammar · medium
易错句子These plants usually reproduce by self.
正确表达These plants usually reproduce by selfing.
介词 by 后表示“通过某种方式”要用动名词，动词 self 的动名词是 selfing。汉语“通过自体受精”是名词性说法，直译成 by self 就丢了动词的 -ing 形式。
grammar · medium
易错句子Many garden flowers self themselves every spring.
正确表达Many garden flowers self every spring.
self 作动词本身已含“自身”的意思，即自我授粉，后面不能再加反身代词 themselves。汉语说“给自己授粉”，学习者常按字面补出反身宾语。
自交率
The selfing rate of this species is over ninety percent.
这个物种的自交率超过90%。
自交后代
The selfed progeny were smaller than those from cross-pollination.
自交后代比异花授粉的后代植株更小。
自交物种
Selfing species often have small, inconspicuous flowers.
自交物种通常开小而不起眼的花。
自交种子
Plants grown from selfed seeds show little genetic variation.
由自交种子长成的植株遗传变异很小。
容易自交
This variety selfs readily in the greenhouse.
这个品种在温室里很容易自交。
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