2 sentences

1. 当海豚玩气泡时，它们是在磨练迷惑和捕捉猎物的技巧。

   dāng hǎi​tún wán qì​pào shí, tā​men shì zài mó​liàn mí​huo hé bǔ​zhuō liè​wù de jì​qiǎo.

   When dolphins play with air bubbles, they are honing their skills at confusing and catching prey.

   Source: CCMatrix

2. 他们不能含糊其辞，他们必须磨练自己的想法，这是一项需要实践的重要技能。

   tā​men bù​néng hán​hu​qí​cí, tā​men bì​xū mó​liàn zì​jǐ de xiǎng​fa, zhè shì yī xiàng xū​yào shí​jiàn de zhòng​yào jì​néng.

   They can’t be vague, they have to hone their ideas, an important skill that takes practice.

   Source: CCMatrix