to start having doubts about a decision you have made
对做出的决定产生怀疑 (dui zuo chu de jue ding chan sheng huai yi)
"I'm having second thoughts about buying such an expensive car."
"我对买这么贵的车有第二个想法。" (wo dui mai zhe me gui de che **you di er ge xiang fa**)
there is no limit to what you can achieve
An undocumented way of accessing a system or software, usual...
to dominate a particular market
to gradually work on something to achieve a result
to lose consciousness temporarily
working late into the night
