1. As soon as the pie was served, she digged into it heartily.
    馅饼一上来，她就大口大口地吃起来。

2. He is digging into Chinese history.
    他正在钻研中国历史。

1. 深入钻研：4.die out 消失,灭绝 | 5.dig into 深入钻研 | 6.dig out 发掘出,发现

2. 钻研：dig in 掘土以掺进 | dig into 钻研 | dig one's fect in 固执已见

3. 探究：in difficulty 处境困难 | dig into 探究 | dig out 挖出,查出(事实)

4. 探究,津津有味地吃：differ from in...和...在某方面不同 | dig into探究,津津有味地吃 | dig out挖出,查出

1. examine physically with or as if with a probe

    e.g. probe an anthill

    Synonym: probepoke into