2 sentences

1. 这个决定对公司的发展具有关键性的影响。

   zhè gè jué​dìng duì gōng​sī de fā​zhǎn jù​yǒu guān​jiàn​xìng de yǐng​xiǎng.

   This decision has a crucial impact on the company's development.

   Source: Dong Chinese Dictionary

2. 淋巴在人体的免疫系统中起着关键性的作用。

   lín​bā zài rén​tǐ de miǎn​yì xì​tǒng zhōng qǐ zhe guān​jiàn​xìng de zuò​yòng.

   Lymph plays a key role in the human immune system.

   Source: Dong Chinese Dictionary