标志

自我zìwǒ怀疑huáiyí是shì聪明cōngming的de第一dìyī标志biāozhì。

To have doubts about oneself is the first sign of intelligence.

红色hóngsè，相xiāng对于duìyú绿色lǜsè，是shì危险wēixiǎn的de标志biāozhì。

Red, as opposed to green, is a sign of danger.

红色hóngsè是shì危险wēixiǎn的de标志biāozhì，与yǔ绿色lǜsè相对xiāngduì。

Red, as opposed to green, is a sign of danger.

晶体管jīngtǐguǎn的de发明fāmíng标志biāozhì著zhù一个yī ge新时代xīnshídài的de开始kāishǐ。

The invention of the transistor marked a new era.