I think that there are two forces on Earth you never want to be fighting. One is Mother Nature, the other is love.

语音讲解
单词发音
forces /fɔːsɪz/
什么时候发音要加/ɪ/?
凡是以s、z、x、ch、sh结尾的词,在该词语末尾加上后辍-es构成复数.
读音变化：统一加读[iz].
例：bus→buses; quiz→quizzes; fox→foxes; match→matches; flash→flashes; fighting /ˈfaɪtɪŋ/; nature /ˈneɪtʃə $ -tʃər/
连词发音
there are two forces on Earth /ðeərətuːfɔːsɪzɒnɜːθ/
the other is/ ðijˈʌðərɪz/
轻读重读
重读：forces/fighting
弱读：that/are/to

词汇讲解
1.force
释义：a group of people who have been trained to do military work for a government or other organization 武力; （社会） 势力
例句：Peace cannot be imposed by force.
和平是不能通过武力强加获得的。
2.Mother Nature
释义：used to talk about nature, especially when it is thought of as a force that affects people and the world 大自然 自然之母
例句：
Now it's very urgent to protect the mother nature, to protect animals.
现在已到了保护我们地球母亲，保护动物们的紧急时刻！

on Earth/on earth/on the earth 的区别
on earth 的意思是：究竟，到底
on the earth 的意思是：在世上，在地上
on Earth： 在地球上
Earth首字母大写时为专有名词 地球。小写时意为“土地”。
举例：
Who on earth will go with me? 究竟谁跟我一起去？
I shall not fear anyone on the earth. 我不会畏惧这世上的任何人
The Earth revolves around the Sun.地球绕着太阳转。

活学活用
fight verb. 战斗; 斗争; 打架
英文：She was always arguing with him and fighting with him
中文：她总是跟他争辩吵嘴。

语法讲解
I think that...that引导宾语从句，在从句中，you never want to be fighting是一个省略了引导词that/which的定语从句，修饰forces.

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