To limit the risk to a one-in-four chance [of 2 degree C warming], then total CO2 in the first half of the 21st century has to be kept below [one trillion] metric tons.
要想将风险限制到四分之一（变暖2摄氏度），那么21世纪上半段CO2的总排放量必须保持在一万吨之下。
We are sorry that you have not issued (opened) the relevant L/C covering 2 metric tons of Longjing Tea.
很抱歉，贵司至今还未开具相应的2公吨龙井茶的信用证。
This contrlaw is for 250 metric tons of groundnuts near the RMB1800 per M/T C&F Copenhagen.
这是一份250吨花生的合同，价钱为每公吨哥本哈根基钱加运费价1800元。
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