防

fáng to protect; to defend; to guard against; to prevent

追踪

zhuī zōng to follow a trail; to trace; to pursue

比特币

bǐ tè bì bitcoin (virtual currency)

混合

hùn hé to mix; to blend

到期

dào qī to fall due (loan etc); to expire (visa etc); to mature (investment bond etc)

提醒

tí xǐng to remind; to call attention to; to warn of

TG:@xrkejiqrd