这道牛肉需要在烤箱里慢烤四个小时才能变得软嫩多汁。

This cut of beef needs to be ___slow-roasted in the oven for four hours to become tender and juicy.

他的厨艺是经过多年慢工出细活磨练出来的。

His cooking skills were ___slow-roasted through years of practice and patience.