The aerial doesn't look very secure to me.

我看这天线不太牢固。

《牛津词典》

It's not a very secure way to make a living.

以此谋生终非长久之计。

《牛津词典》

That's not very secure!

这并不非常安全！

youdao

We believe very much in Israel's right to secure itself, to administer its laws,"

VOA: standard.2009.08.06

You can brute force it and unfortunately, the so-called Caesar cipher is not very secure because if you assume, for our purposes in English alphabet with 26 characters, say all lowercase for all uppercase, my God, you only have to try like 24, 25, 26 possible rotations until you can figure out what his secret message is.

你可以强行解密但是不幸地是，所谓的凯撒密码不是很安全的,因为如果假设，对于我们的26个字符的字母表,指明所有的小写为大写，我的天，你只要试24，25次，26次就可以解答出,密文的内容。

哈佛公开课 - 计算机科学课程节选

So what we think we know derives chiefly from archeological evidence, which is before writing--mute evidence that has to be interpreted and is very complicated, and is far from secure.

我们目前所认为的史实,主要都是从考古证据中所得,这些无声的证据出现于文字记录之前,因此就需要繁复的考证及解读,这些考证未必可靠

耶鲁公开课 - 古希腊历史简介课程节选

"It is very secure as a platform, which is, naturally, important to our customers, " he said.

CNN: How to turn your phone into a biometric scanning machine

Moving the agricultural show from Belfast would provide a very secure anchor, he added.

BBC: Question Time: OFMDFM and Regional Development

Bitcoins tend not to be very secure, says Richard Booth, a consultant at RSA, a cyber-security firm.

ECONOMIST: Bitcoin