3. Even by modern standards, the 46,000 ton Titanic was a colossal ship.新概念英语听力

Even by modern standards 即使根据现代的标准
even 起到了加强语气的作用;

表示"根据"的介词词组
by依据,

e.g. by regulation 依据规则\by rule 依据条例\by our estimate 根据我们的估计\by one's looks\by one's appearance 根据某人的长相
according to 依据 （事实、课文等客观存在的现实）
e.g. according to the fact 依据事实\ according to the text 依据这篇课文
in accordance with 更为正式，常接法律等
e.g. in accordance with law\rules

在我看来： in my opinion

4，At that time, however, she was not only the largest ship that had ever been built, but was regarded as unsinkable, for she had sixteen watertight compartments.

be regarded as: be considered to be, be thought of as 把...看作为
regard sb. / sth. As 后面可以接 n. / pron. / adj. / doing / done

e.g. I regarded his idea as totally unacceptable.

e.g. We can't regard the matter as settled.

for 表示原因