Fusions were common between strains from deciduous hosts or coniferous hosts.是什么意思？

Fusions were common between strains from deciduous hosts or coniferous hosts.

来自阔叶树或针叶树寄生的菌系间融合是普遍的.

fusions

n. 熔合( fusion的名词复数 )，核聚变，联合，合并；

例句
His previous fusions of jazz, pop and African melodies have proved highly successful.
事实证明他先前融合了爵士乐、流行乐和非洲旋律的作品非常成功。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

common

adj. 普通的，通俗的，[数学]公共的，共有的；n. [法律]（对土地、水域的）共有权，公共用地，普通，平民；

例句
The pharmacist can assist you with the treatment of common ailments.
药剂师能帮你治疗一般的病痛。

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

strains

v. 拉紧( strain的第三人称单数 )，尽量利用，尽全力，过滤；

例句
...new strains of crops that can withstand arid conditions.
能抵抗干旱条件的新品种作物

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

deciduous

adj. （指树木）每年落叶的；

例句
European anemone with solitary white flowers common in deciduous woodlands.
林地生长的每年落叶的只开一次白花的欧洲种银莲花.

hosts

n. [计算机]主机( host的名词复数 )，军队，（寄生动植物的）寄主，主办人[地方，机构等]；

例句
Tonight she hosts a ball for 300 guests.
今晚她做东举办一场有300名客人参加的舞会。

or

conj. 或，或者，还是，不然，否则，左右；prep. <古、诗>在…之前，比…更早；n. [纹章]黑金色、黑色；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

coniferous

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例句
Fusions were common between strains from deciduous hosts or coniferous hosts.
来自阔叶树或针叶树寄生的菌系间融合是普遍的.