3 sentences

1. 啦啦队正在赛场上为球员们加油助威。

   lā​lā​duì zhèng​zài sài​chǎng shàng wèi qiú​yuán men jiā​yóu zhù​wēi.

   The cheerleaders are cheering for the players on the field.

   Source: Dong Chinese Dictionary

2. 观众们在场边大声呐喊，为运动员助威。

   guān​zhòng men zài chǎng​biān dà​shēng nà​hǎn, wèi yùn​dòng​yuán zhù​wēi.

   The spectators cheered loudly from the sidelines to encourage the athletes.

   Source: Dong Chinese Dictionary

3. 观众席上传来了为运动员助威的呐喊声。

   guān​zhòng​xí shàng chuán​lái le wèi yùn​dòng​yuán zhù​wēi de nà​hǎn shēng.

   Shouts of encouragement for the athletes came from the stands.

   Source: Dong Chinese Dictionary