许多自然科学理论之所以被称为真理，不但在于自然科学家们创立这些学说的时候，而且在于为尔后的科学实践所证实的时候。
許多自然科學理論之所以被稱為真理，不但在於自然科學家們創立這些學説的時候，而且在於為爾後的科學實踐所證實的時候。
xǔ duō zì rán kē xué lǐ lùn zhī suǒ yǐ bèi chēng wéi zhēn lǐ ， bù dàn zài yú zì rán kē xué jiā men chuàng lì zhè xiē xué shuō de shí hou ， ér qiě zài yú wéi ěr hòu de kē xué shí jiàn suǒ zhèng shí de shí hou ．
Many theories of natural science are held to be true not only because they were so considered when natural scientists originated them, but because they have been verified in subsequent scientific practice.
Mandarin
终有一日，村子里来了一个天文学家。他在我家门前路过，突然发现了这块石头，眼光立即就拉直了。
終有一日，村子裏來了一個天文學家。他在我家門前路過，突然發現了這塊石頭，眼光立即就拉直了。
zhōng yǒu yī rì ， cūn zi lǐ lái le yī gè tiān wén xué jiā ． tā zài wǒ jiā mén qián lù guò ， tū rán fā xiàn le zhè kuài shí tou ， yǎn guāng lì jí jiù lā zhí le ．
Eventually there came a day when an astronomer came to the village. [As] he passed by before our home's door, he discovered this rock and his gaze was immediately drawn directly to [it].
Mandarin
否则你的劳动就没有对象，你就只能做鲁迅在他的遗嘱里所谆谆嘱咐他的儿子万不可做的那种空头文学家，或空头艺术家。
否則你的勞動就沒有對象，你就只能做魯迅在他的遺囑裏所諄諄囑咐他的兒子萬不可做的那種空頭文學家，或空頭藝術家。
fǒu zé nǐ de láo dòng jiù méi yǒu duì xiàng ， nǐ jiù zhǐ néng zuò lǔ xùn zài tā de yí zhǔ lǐ suǒ zhūn zhūn zhǔ fù tā de ér zi wàn bù kě zuò de nà zhǒng kōng tóu wén xué jiā ， huò kōng tóu yì shù jiā ．
Otherwise, you will have nothing to work with and you will be nothing but a phoney writer or artist, the kind that Lu Hsun in his will so earnestly cautioned his son never to become.