重點(diǎn)講解：
1. agree on 商定；議定；就…達(dá)成協(xié)議；
We rarely agree on what to do.
我們很少在要做的事情上看法一致M(Y;=e&)Dcon6m。
2. hold back 抑制住,忍住；
He could no longer hold back his tears.
他再也無法控制住眼淚JjA6]te[NL0Zze。
3. be involved in 卷入的；參與的；與…有密切關(guān)聯(lián)的；
She's involved in many extra-curricular activities.
她參加了許多課外活動(dòng))!#OYY@LNmX_K#f-tyuy。
4. opt in 決定參加；決定加入；
He proposed that only those countries which were willing and able should opt in to phase three.
他提議只有那些有意愿而且有能力的國家才應(yīng)參與第三階段XNgqfq7OF2En%。