to be lost in thought or imagination
陷入思维或想象之中 (xiànrù sīwéi huò xiǎngxiàng zhī zhōng)
"He didn’t hear me because he was in a world of his own."
"他没听到我说话，因为他 在自己的世界里。" (Tā méi tīngdào wǒ shuōhuà, yīnwèi tā **zài zìjǐ de shìjiè lǐ**.)
to end a disagreement and become friendly again
to improve an existing product or idea
very high speed; extremely fast progress
Use your time effectively and make the most of every moment.
to behave in a confident and assured way
it's very easy
