This is the VOA Special English Agriculture Report.

come from出生于
例句：She came from a long line of singers.
她出身于一个歌手世家。

2. Now, farmers in some areas can no longer depend on that popular herbicide alone to defend against pigweed.

no longer不再, 已不, 不复, 再也不
例句：The city's water supply is no longer adequate for its need.
这个城市的供水已不敷需求。
depend on依赖, 依靠
例句：My success depends on my friend helping me.
我的成功是依靠我的朋友帮助我。
defend against保护…不受…, 防御
例句：The fort cannot be defended against an air attack.
这座要塞遭到空袭时无法防御。

3. For example, IPM calls for farmers to rotate their crops instead of planting the same ones in the same soil year after year.

call for要求
例句：The letter calls for an investigation of the facts.
来信要求对这些事实进行调查。
instead of (用…)代替…, (是…)而不是…, (用…)而不用…
例句：Will you go to the party instead of me?
你替我赴宴好吗?