At that time our relations were going upwards, but since then they have been going downwards [downhill].

那时我们的关系是走上坡路，此后就开始走下坡路了。

《新英汉大辞典》

Since that time, hundreds of astronauts have been into orbit, but none has ventured further.

从那时起，已经有数百名宇航员进入轨道，但是，没有人再做进一步的尝试。

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Graphene screens have been around since 2004, but this is the first time that researchers were able to successfully produce them in larger quantities in a roll-to-roll production.

自从2004年开始，石墨烯触屏已经被广泛使用了，但这是第一次研究人员们用连续卷轴式成功地大批生产它。

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Abolhassan Bani Sadr, who was Iran's first president after the Islamic Revolution, says the power of the bazaar has diminished since that time, but that that it still carries considerable weight.

VOA: standard.2010.07.20

And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

But, since that time, they've cleaned it up a lot.

但从那以后，他们大力整顿了这个地方。

哥伦布的故事 - SpeakingMax英语口语达人

But since that time, Major League Baseball has tweaked its criteria for choosing post-season umpires.

FORBES: You Cannot Be Serious! The Worst Calls In Sports History

But since that time, both countries have stopped testing altogether, believing that such actions jeopardize the commercial and scientific uses of space.

CENTERFORSECURITYPOLICY: 2007: A Chinese space odyssey

Alex Thorndike, senior trader, precious metals and foreign exchange, MKS Capital, said the action by the managed-money crowd resulted in a 25% reduction in their net long position, but added that since the time period only goes until July 24, it does not include any buying that happened toward the end of the week.

FORBES: FOCUS: Speculators Cut Back On Bullish Exposure To Precious Metals --CFTC