（七）提单，是指用以证明海上货物运输合同和货物已经由承运人接收或者装船，以及承运人保证据以交付货物的单证。
第一节 打好关键核心技术攻坚战
，详情可参考搜狗输入法
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causal = q_idx[:, None] = k_idx[None, :]
Downsides: Light manual upkeep is needed every few daysThe PetSafe ScoopFree litter box doesn't mask the smell as well as a Litter-Robot and its filter do. So while my Litter-Robot is pretty much odorless and hands off until the drawer needs to be emptied, my ScoopFree requires a light refresh every few days between tray changes to keep it from stinking.