Something promised, given, or done that has the effect of making an agreement a legally enforceablecontract.
对价，承诺被允诺、提供或做成的事物，它能使一项协议成为具有法律效力的契约。
2
After the acceptance occurs, the parties have an enforceablecontract (assuming that there is no requirement of a writing, as there probably would be in this situation).
本例很有可能会被要求采用书面形式。
3
They are enforceable by laws. and any pariy who defaults the contract may be sued and forced to make compensation.