一直 jat¹ zik⁶ {yī zhí}

1. straight (in a straight line)
2. continuously
3. always
4. from the beginning of ... up to ...
5. all along

一直行 jat¹ zik⁶ haang⁴ {yī zhí háng}

keep walking, keep walking straight

一直以來〔---来〕 jat¹ zik⁶ ji⁵ loi⁴ {yī zhí yǐ lái}

1. in the past always
2. for a long time now
3. until now

一直往前 jat¹ zik⁶ wong⁵ cin⁴ {yī zhí wǎng qián}

straight ahead