Lacks confidence and poise is nervous and ill at ease.
信心不足,不够自信,精神紧张,心神不定。
Easier said than done.
说话容易做事难。
On our way home that night I looked down and saw that the necklace was not around my neck any more. I told Pierre. We rushed back to the palace and looked for it.We asked everyone there if they had found a necklace, but without luck. We couldn't find it;