to begin to feel uncertain or unsure
开始感到不确定或不安全
"After a few failures, doubt began to creep in."
"经过几次失败后，怀疑开始涌现。"
to learn and grow from failure
to continue progressing without slowing down
to monitor or record information consistently
to ruin a chance or opportunity by mistake
to make a fresh start or change for the better
to be the first to do something or lead the way
