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Here is the first key to being a successful public speaker: Talk about something you know about.

以下是成为一个成功演说者的第一要诀：谈论你所熟知的事物。

But," says Von Braun,"I decided that if I had to know about math to learn about space travel and rocketry, then I'd have to learn math.

他就是那样做的。

We all know about the size of dinosaurs, of course, but how about a rodent the size of a bull, a sea scorpion bigger than a man, a frog as large as a beach ball, a penguin the size of a small adult human, a 1,000-pound ground-sloth-like marsupial, and a shark that may have grown longer than 50 feet and weighed up to 30 times more than the largest modern great white?

当然我们都知道恐龙的尺寸，但是要是一个公牛一样大的啮齿动物，一个比人还大的海蝎，海滨卵石一样大的青蛙，一个成年男子身高的企鹅，一个1000磅的外貌像地懒一样的有袋动物，一个也许能长到身长50英尺(1英尺=30厘米)，体重超过现代最大大白鲨的30倍的鲨鱼呢？

Here we're talking about buddhanature, and if you want to know about buddhanature, then Maitreya's Uttaratantra Shastra is the text you have to study.

这里我们讨论的是佛性。如果你希望了解佛性，弥勒菩萨著的《究竟一乘宝性论》是你需要研读的教材。

He said that he did not know about kings, he knew only about King Solomon in the Bible.

他说他不知道有关国王的事情，他只知道《圣经》里的所罗门王的一些情况。

Thinking about it, I'd have to agree with him based on what we know about Tae Tae's personality.

我想了一想，基于我们对泰妍个性的了解，我也不得不同意他的想法。

If you do not already know about word stress, you can try to learn about it.

如果您还没有了解重音，您可以尝试了解它。

Caro told me all about it last summer and her mama would die if she thought Caro even know about it.

这里的&her mama&显然是指Caro的妈妈，郇译P99为：去年夏天，卡罗告诉了我这事的全部经过，如果她妈妈想到她儿子能干出这种事，一准会气死的。

And even people who know about modern classics like Carcassonne or The Settlers of Catan can find something new to be excited about this holiday season.

让即使是熟悉&卡尔卡松&和&卡坦岛&这类现代经典游戏的人们，也能在这个假期找到新的乐趣。

For long time, we are taught that the water we drink is hygeian, the food we eat is safe, and the government says noting about how to prevent the potential threat caused by environmental pollution, also we have no awareness to know about whether our water, air, quality and the food will be hazard to our life.

长期以来，我们接受的信息就是我们喝的自来水是卫生的，我们的食物是安全的，政府没有告诉我们应该怎么做才能预防各种因环境污染所造成的潜在威胁，我们也没有意识去了解我们的水质，了解我们的空气质量和我们的食物会不会对我们的生命造成威胁。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失