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| 1. | He considered that his social position was perfectly secure. |
| 他认为，他的社会地位是绝对稳固的。 |
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| 2. | Thinking ourselves perfectly secure, we began to doze. |
| 我们认为太平无事了，一个个都昏昏欲睡。 |
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| 3. | The LZ was setup and maintained in a perfectly safe and secure manner, with a textbook 4-point LZ perimeter |
| 该起降区域的建立和维护一直保持著完备的安全防护，并符合教科书中指出的四项直升机起降区域的要求。 |
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