1、necessary

必要的;必需的

I kept the engine running because it might be necessary to leave fast.

我没让发动机熄火，因为也许需要迅速离开f,HS@TkDG^qi75。

We will do whatever is necessary to stop them.

我们要采取一切必要措施去阻止他们fmtivXx7SHH。

(结果或联系)必然的，势必的

Wastage was no doubt a necessary consequence of war.

巨大的损耗无疑是战争的必然结果vzBN.k&MJpTH[eEHj_。

Scientific work is differentiated from art by its necessary connection with the idea of progress.

科学工作与艺术的区别在于它与人类进步有着必然联系U;[urFrT3Z;t0uA。

如果必要的话

If necessary, the airship can stay up there for days to keep out of danger.

必要时，飞艇能在那里停留数天以躲避危险WdrL8Vj#w!Q2yQsXQL*_。

The army needs men who are willing to fight, when necessary.

军队需要在必要时愿意投入战斗的军人&Q%wD*Xfc,l。

2、ignite

点燃;(使)燃烧;着火

The bombs ignited a fire which destroyed some 60 houses.

炸弹引发的大火烧毁了大约 60 栋房屋rsX%44_AOXiUHshc!。

The blasts were caused by pockets of methane gas that ignited.

爆炸是由甲烷气囊被引燃造成的zC]v_ddG]t_。

激起;使激动

There was one teacher who really ignited my interest in words.

曾经有一位老师真正激起了我对文字的兴趣rTNlQ#SVp4Jk(tcyTf。

The recent fighting in the area could ignite regional passions far beyond the borders.

最近该地区的战斗可能激发边境以外整个地区的激动情绪MmOs@C7~o9m|5TwX3Sw^。