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1·Those who did well on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body's first line of defense against germs.

那些在记忆测试中表现良好的人，其体内的免疫球蛋白 A 水平会升高。免疫球蛋白 A 是一种抗体，是人体抵御细菌的第一道防线。

2·It is your computers first line of defense.

它是你的电脑第一道防线。

3·A positive attitude is your first line of defense.

积极的态度是你的第一道防线。

4·It is the first line of defense against disease.

是防御疾病的第一道防线。

5·Error messages are your first line of defense as a developer.

出错消息是作为开发人员的第一道防线。

6·That is why a positive attitude is your first line of defense.

因此，积极的态度才是你的第一道防线。

7·The ego is the first line of defense between the self and the outside world.

自我是本性和外部世界之间的第一道防线。

8·The first line of defense in a secure program is to check every untrusted input.

安全的程序中第一道防线是检查每一个不可信的输入。

9·One more line of defense against the unnamed horrors that lurked beyondher walls.

为了防御墙外隐伏的恐怖，多加上一层防护。

10·Passwords tend to be our main and sometimes only line of defense against intruders.

密码可以看作我们主要，甚至某些情况下唯一可用于防范入侵的防线。