He told the children to sit up and not slouch.

Let's sit down and have a rest.

让我们坐下来休息一会儿吧.

Get on with life and don't sit back and mope.

活跃一些享受生活，不要闲呆着闷闷不乐的。

This should make people sit up and take notice.

这件事应引起人们的关注。

Sit up straight. Don't slouch.

挺起胸坐直，别歪歪斜斜的。

"May I sit here?" — "Please do."

“我能坐这儿吗？”——“请坐。”

Let's sit here and visit together for a while.

让我们坐在这里谈一会儿.

When you stand, they stand; when you sit, they sit.

你站着他们就站着，你坐下他们就坐下。

He says he'll sit there until hell freezes over before he'll pay them one cent.

他说他宁可永远坐在那里，也不会付给他们一分钱。

The patient was but poorly able to sit up.

病人仅能勉强坐起来.

The vaccines were kept cool in refrigerators.

疫苗放在冰箱中冷藏。

His team are at the forefront of scientific research into vaccines.

他的小组处于疫苗科研的最前沿.

My guess is that the chance that these vaccines will work is zero.

我猜测这些疫苗根本不可能奏效。

Egg-grown vaccines should be avoided in egg-sensitive patients.

鸡蛋过敏的病人应避免用鸡蛋培育的疫苗.

Vaccines also induce cellmediated immunity.

疫苗也引起细胞介导免疫.

Whatever vaccines ultimately become available, there is no question that such preventives are urgently needed.

不管最终出现的是哪种疫苗, 对它们的迫切需求是毫无问题的.

People are easily attracted by your special temperament, but flinch from your cold appearance.

人们很容易被你独特的气质唆吸引, 但是却在你冷漠的外表下望而却步!

I was acting on my own initiative and judgment.

我根据自己的主张和判断行事.

I work best on my own.

我独立工作的时候效果最好。

I grounded my argument on my own experience.

我根据经验而立论.

I'd rather meet him here on my own home ground.

我宁愿在我自己的地盘上见他。