What I mean is that either side could cancel the training contract after the six months as long as it's in writing.
我的意思是，只要是书面形式，任何一方都可以在六个月后取消培训合同。
英语百科
Training contract
A training contract is a compulsory period of practical training in a law firm for law graduates before they can qualify as a solicitor in the United Kingdom (UK), the Republic of Ireland, Australia or Hong Kong, or as an advocate and solicitor in Singapore. During the training period, the participant is known as a trainee solicitor or trainee lawyer (in Singapore).