1. With occasional mistakes, of course."
    当然，偶尔也会犯一些错误。"

2. The key is to be satisfied with gradual improvement, expecting and accepting the occasional slips that come with any change.
    关键是你要对逐渐的进步感到满足，要预见到并接受可能伴随这种改变而来的偶尔失误。

3. One bought three of her original drawings, and she did occasional work for the other, sketching a lot of whales, dragons, castles and mythical animals.
    其中一家买下了她的三张原创画作，而在另一家，她偶尔兼兼职，画了大量的鲸鱼、龙、城堡和传奇动物。

4. I get an occasional letter from him , that´s all.
    我收到他偶而写来的一封信，如此而已。

5. Which may keep company with the vessel for an hour without visible or more than occasional movement of wing.
    它们随船飞行一小时也难得见其扇动一下翅膀。