He held his breath as a rat scuttled past.
见一只老鼠跑过，他屏住了呼吸。
我的猫抓了一个老鼠。
这有一只老鼠。
我有一只老鼠。
A rat could get into spaces we couldn't get to, and a rat would get out if it wasn't safe.
老鼠可以进入我们无法进入的空间，如果不安全，老鼠会逃出来。
Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
Scientists have used the latest imaging techniques to peer inside the digestive system of a python an hour after it had eaten a rat whole.
在蟒蛇吞噬了一整只老鼠一小时之后，科学家利用最新的成像技术窥视了其体内的消化系统。
To train a rat, the experimenter placed it in an operant conditioning chamber: a small plastic box with a lever at one end.
为了训练小鼠，实验人员把它放在一个操作性条件反射室：一个一端置有操作杆的塑料箱。
If I don't send a picture, he will smell a rat.
如果我不寄张照片，他会起疑心。
我觉得事情不妙。
Suddenly there came a rat-a-tat on the door.
突然传来了一阵梆梆的敲门声。
Study anti-inflammation mechanism of Plantago Asiatica L in a rat model with traumatic synovitis.
研究车前草在创伤性滑膜炎大鼠模型中的抗炎机制。
The little dog looks like a rat.
这只小狗看起来像只老鼠。
Oneday, I took a rat home from the lab.
有一天，我从实验室带了一只老鼠回家。
Her task was to clone a rat gene called neu.
她的任务是克隆出一个老鼠的神经鞘基因。
And... good food is... hard for a rat to find!
而且……好吃的食物……对于一只老鼠，是非常难找到的。
一只猫和一只老鼠。
I don't want to say he steals them, but I really smell a rat.
虽然我不想说他偷我的书，但我确实觉得不对劲。
In a typical experiment, a rat was placed in a cage with a light.
在其中一项典型实验中，一只白老鼠被放入有一束光照射的笼子中。
Shareholders of targeted companies are also starting to smell a rat.
目标公司的股东也开始嗅到了点什么。
Didn’t you smell a rat when they agreed to sell you the goods at such a price?
当他们同意把那批货以那样的价格卖给你的时候，你难道没有感到有些可疑么?
I was trying to catch a rat, but somehow he came nosing around and got in my trap.
我想逮的是耗子，可它不知怎么跑到附近，踩进了我下的夹子。
Bobcats would normally cross the border to find mates or catch dinner-this one caught a rat.
山猫一般要跨越边境去寻找配偶或捕捉食物——这一只山猫捉住的是一只老鼠。
A second, more concrete type of threat arises if a rat spots a cat at the other side of the meadow.
第二种威胁则更为确定，老鼠能够发现草地另一侧的猫。
A second, more concrete type of threat arises if a rat spots a cat at the other side of the meadow.
第二种威胁则更为确定，老鼠能够发现草地另一侧的猫。
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