Just, only, time flies, time mark.

只是，只是，时间荏苒，岁月有痕。

Time mark is just the triggering time mark, it may be directly judged reading by waveform.

其时标时刻即为触发时刻, 可通过波形判读.

Meiyou VP Zhiqian is formed by negative mark, verbal part and time mark.

“没有VP之前”是由否定标记、动词性成分和时间标记组成的结构。