Noting the decline in hunts of whales and other sea mammals over the last few decades, the IUCN said accidental killing in fishing gear was now the "main threat" to these species.
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In the 20th century the main threat to international security was superpower conflict; today it is failing states.
20世纪，国际安全的主要威胁是超级大国之间的冲突，而如今的主要威胁是国家的衰落。
It is now the main threat to human security in the Andes.
如今，气候变化成为安第斯山脉人类安全的主要威胁。
The main threat to Lada comes from very cheap Chinese cars.
拉达受到的主要威胁来自价格极低的中国汽车。
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