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1.High-tech drones are flying to the defence of tortoises in California's Mojave Desert.
defence防御；防卫
The land was flat, giving no scope for defence.
这一地区非常平坦，根本没法进行防御。
2.Ms Fedrick noted that if nothing was done to help the tortoises, they would be completely wiped out.
wipe out 使灭绝
The spill could wipe out the Gulf's turtle population.
这次原油泄漏可能会使波斯湾的海龟灭绝。
