但是，各种因素的组合 — — 包括自然选择、农民追求其自身商业利益以及责任问题 — — 都不利于这一可能，发生几率很低，影响也几乎肯定非常小。
But, with a combination of factors – including natural selection, farmers’ pursuit of their commercial self-interest, and liability concerns – militating against such a possibility, the odds are very long, and the impact would almost certainly be very low.