3 sentences

1. 我们必须走在世界前列。

   wǒ​men bì​xū zǒu zài shì​jiè qián​liè.

   We must be at the forefront of the world.

   Source: Dong Chinese Dictionary

2. 我们在科技研发方面必须走在世界前列。

   wǒ​men zài kē​jì yán​fā fāng​miàn bì​xū zǒu zài shì​jiè qián​liè.

   We must be at the global forefront of scientific research and development.

   Source: Dong Chinese Dictionary

3. 这座港口的年货物吞吐量位居世界前列。

   zhè zuò gǎng​kǒu de nián huò​wù tūn​tǔ​liàng wèi​jū shì​jiè qián​liè.

   The annual cargo throughput of this port ranks among the highest in the world.

   Source: Dong Chinese Dictionary