关于发明的英语作文50词【一】
1。thereof
以”there”为前缀加上介词构成的词，如thereafter， thereby， therein， thereinafter， thereinbefore， thereon， thereof， thereunder， thereupon， therewith等，在文中具体指什么，需要读者依照合同的上下文来判断，因而理解起来比较复杂，请看下例：
This Agreement is written in the English language。 In case of any discrepancy between the English version and any translation thereof， the English text shall govern。 句中”the English version and any translation thereof”从上下文判断意为 “the English version and any translation of the English version”，即thereof一词代替of the English version。与以here开头的词如hereof的理解方法类似。
2。therein
该词意为in that， in that particular
context， in that respect，“在那里”，“在那点上”，“在那方面”，表示上文已提及的“合同中的”“工程中的”。如：the contract or any part thereof意为the contract or any part of the contract，合同或合同的任何部分。
3。thereto
该词意为：to that，“随附”，“附之”，如：“Contract Products” means the products specified in Appendix 2 to this Contract， together with all improvements and modifications thereof or developments with respect thereto。 句中or developments with respect thereto 意为：or developments with respect to the developments。
4。thereunder
该词意为：under that， “在其下”，“依照”，如：The Borrower fails to pay any amount payable thereunder as and when such amount shall become payable。 句中any amount payable thereunder意为any amount payable under the contract。
关于发明的英语作文50词【二】
I like elephants. They are very gentle and they can walk quietly and help people move heavy things.
Elephants are the biggest animals on the land.They are big and strong.They have big ears and trunks. It weights some ninety kilograms and is about one metre high when born. When it is 12 years old, it is over three meters high and does not grow any more. Elephants are usually grey in color. They usually live in groups and care for each other.
We should protect elephants . They are the friends of ours.
关于发明的英语作文50词【三】
我爸爸喜欢抽烟，每天都要抽好多根烟。我想了好多办法来阻止他抽烟，可是都没有效果。所以我想发明一种灭烟器，让他没办法抽烟。
这种灭烟器在家里时像五颜六色的仙人球，一旦发现有人抽烟，就会立刻变成一把隐形的枪。这种枪只有针孔大小，薄薄的像蚕蛾的'翅膀一样，无色透明，肉眼根本看不见。所以，在它工作时，吸烟的人就不会发现它。
一旦它发现“敌情”，就会迅速地从仙人球变形为隐形枪，展开翅膀飞快地冲向刚刚点燃的香烟。隐形枪瞄准香烟，从枪口喷出一种透明的药水直射点燃的香烟头。香烟头一眨眼功夫就被熄灭了，再点也点不燃了！只要爸爸一点烟，灭烟器就一次又一次地把他的烟头熄灭，直到爸爸永远放弃抽烟为止。这样我就再也不用苦口婆心地劝爸爸戒烟了。
隐形灭烟器不但能帮助烟民戒烟，还能充当仙人球净化空气、美化环境呢！这真是一举两得呀！
