1.involve 涉及
Any investment involves an element of risk.
任何投资都有一定的风险 。
2.deliver 递送
Leaflets have been delivered to every household.
传单已发送到每家每户 。
3.chop up 割断
Chop up three firm tomatoes.
拿3个硬西红柿切碎 。
4.culprit (造成问题或麻烦的) 原因
The main culprit in the current crisis seems to be modern farming techniques.
当前这场危机的罪魁祸首好像是现代农业技术 。