1、be instrumental in在…方面起重要作用;
Nokia Siemens said the sale would be instrumental in helping it improve its position in the United States and Japan, as well as bolster diminishing profits.
诺基亚—西门子说,交易将有助于提升它们在美国和日本市场中的位置,也会支撑它们正在逐渐减少的利润 。
2、fight against与…作斗争;
"China is a vital ally in the fight against global warming, " he said.
他说:“在对抗全球变暖的斗争中,中国是一个重要的盟友 。”