redouble their effort
加倍努力
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They should also redouble their effort to develop alga-derived biofuel and synthesize biofuels by gasification of biomass.
同时应加大海藻生物燃料和生物质气化合成生物燃料的开发力度。
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